The cost of interrupted work (2023)

110 _vaporwave_ 58 8/23/2025, 9:45:06 PM blog.oberien.de ↗

Comments (58)

Waterluvian · 3h ago
Some days an interruption will throw me off my train of thought, and I spend the remaining six hours collecting discarded bottles and railway ties for hopeful use somewhere, somehow, sometime.

Other days an interruption costs me pretty much nothing.

I’m still trying to figure out how to tell which of those days I’m going to have and whether to just not log into Slack for the day.

karmakaze · 1h ago
I've found one thing that minimizes interruption cost: pair programming. At one startup we pair programmed all day, every day. Resuming from an interruption was almost seamless. Can't explain it, only experienced it.
SoftTalker · 1h ago
If only I wouldn’t prefer stabbing myself in the leg with a rusty knife over pair programming.
dylan604 · 1h ago
I've never done official pair programming, but I get frustrated when I'm not on the keyboard as I find others think slower.
kmoser · 39m ago
Have you tried plugging in a second keyboard and taking over where necessary? I do a lot of remote work in which my colleague and I work on the same computer and it's quite useful for either of us to jump in with our own keyboard (and mouse). It does take a bit of occasional verbal negotiation to agree on who really knows what to do (and can do it fastest) but if you communicate well then it's pretty easy.
bn-l · 11m ago
Damn I wish I had a relationship with someone like that.
glxxyz · 41m ago
"no the other one, down a bit, no the one above, no go back..."
CGamesPlay · 18m ago
I suspect that this would also lead to interruptions having almost no effect on your productivity.
cosmic_cheese · 21m ago
I think the only thing that might be more frustrating is if my modifier keys rotated at random intervals.
SJMG · 25m ago
Just wait till you learn about "mobbing"… You can feel the money being lit on fire.
Our_Benefactors · 20m ago
This fad died out along with 0% money.
wordpad · 14m ago
Have you tried giving your AI productivity tool a personality so it can guilt trip you the same way?
mettamage · 1h ago
How can you find a startup with a pair programming culture?
lazyasciiart · 1m ago
They’ll tell you.
yablak · 35m ago
Join a startup. If they don't do pair programming, quit.
bubblebeard · 2h ago
My feelings exactly. Whenever I get one of those days I’ve found I get more done away from my desk. Taking a walk in the forest or doing some household chores can really help you get back on track.

Of course at times it’s just better to admit altogether this isn’t a day meant for work and spend it relaxing instead. Usually, the benefit of that is a really productive day at work the day after too, everybody wins.

Waterluvian · 2h ago
Almost all my employers and managers have been very understanding about this. But one of my favourites was a manager earlier in my career who picked up that I was anxious about my work hours and ethic. To paraphrase, he said, “the company isn’t paying you to solve problems M-F 9-5. It’s paying you for when you solve them in the shower or on a walk or when you’re putting your kid to bed, and then come into work and implement the solution.”

I’ve thought about this for years as I tune my work life balance. I’ve never felt like I’m wrongly bringing work home with me that way. It’s always felt like an incredible optimization where my job gives me these puzzles I get to carry with me and work on when I’m bored or my ADHD addled brain screams for stimulation.

junon · 1h ago
You've been very lucky. I wish I had a similar experience. Managers who truly think that way are beautiful creatures.
pockybum522 · 1h ago
Do you happen to know if that one is hiring for anything at the moment? Left to solve problems at that pace, I'm pretty sure I could do some great things for them.
bongodongobob · 52m ago
I've never worked anywhere where I wouldn't be laughed at for suggesting this. "No, we do pay you to work from 9-5, M-F." You are very lucky.
dylan604 · 1h ago
This is one of the very best things to me about work from home. There are times I just get up and go piddle in the garden, take a short bike ride, or even just run an errand. I even do it when I'm stuck rather than just from being interrupted. It helps the brain to essentially, ctrl-z; bg and then move on to the next thing. When I return, I find the job %1 has completed, and I have a new approach/idea that is typically much more successful than the previous attempt of banging my head on the desk/keyboard in frustration. It's much healthier for me than vibe coding around the problem
jakeydus · 23m ago
Sorry my grandmother used to use the word piddle to mean pee so I got a real crack out of this.
apercu · 1h ago
100%!and also why I have been self employed for 11+ years.
nashashmi · 2h ago
So the average is 23 min 15 sec right?
Waterluvian · 2h ago
Ahahaha… I mean… gosh, quite possibly?
thecoppinger · 3h ago
Right there with you :)
PaulKeeble · 3h ago
This is a really common problem with science reporting in general. Its often the case that the news will say things about the paper that aren't in the paper, often they say something that is completely the opposite of what the paper actually represents with its data. Its become such a common thing and its very common when you can't find the referenced study itself from the article. Sometimes its the authors fault and they said things that aren't supported by the data but the science reporters do this a lot.

My basic rule on all science is go at least look at the papers abstract, method and their graphs/data. In 5 minutes you'll be better informed than the pop science article and it gets easier the more you read them.

Interruption do impact getting back in but I find it very variable, I actually if I am doing very strict TDD I recover from interruptions well. If I am busy thinking about a design or doing some more complex algorithm performance analysis its all happening in my head and they take longer. I think it is measurable and you could set up experiments to see how long it took to start producing again and if there is a slow start or not on a well defined programming task.

hinkley · 3h ago
When I work places where interruptions are expected I change how I do my work. So an observer may see them costing me less time but that’s amortized across the rest of my work as a consequence of leaning into interruption. It’s still there, it’s just spread out more.
falcor84 · 3h ago
> This is a really common problem with science reporting in general. Its often the case that the news will say things about the paper that aren't in the paper, often they say something that is completely the opposite of what the paper actually represents with its data.

I wonder if perhaps a part of LLM hallucinations can be explained by them being provided such reporting and having it (mistakenly) tagged as high-quality training data.

devmor · 49m ago
> I wonder if perhaps a part of LLM hallucinations can be explained by them being provided such reporting and having it (mistakenly) tagged as high-quality training data.

Probably (haha) far more of a function of temperature than training data. If the corpus is large enough for your prompt and you turn the temperature all the way down, you will get almost no hallucinations. You then have what is essentially a search engine.

godelski · 2h ago

  > This is a really common problem with science reporting in general.
There's a lot that actually becomes really sinister with this. I'm sure the people writing those news articles pass them off as little white lies, "close enough", or whatever. And in some sense, there's a lot of truth to that. But the problems stem from what grows out of these "small errors" and into far larger ones.

1) it certainly contributes to a significant part of the g̶r̶o̶w̶i̶n̶g̶ distrust in science. People are getting their science from the news, not the horse's mouth. If you report something silly while saying "scientists say" then people will point the finger at the scientists more than they will point to the reporter. The scientists aren't writing in plain English after all[0]. Things like chocolate being healthy for you, red meat causing cancer, or machine learning quantum blackholes. There's always elements of truth to these things but truth is not sensational. Truth and complexity go hand in hand. As complexity decreases you will have to sacrifice accuracy. This is a tough balance to play[1].

2) The public isn't very scientifically literate and it is easy to misconstrue meaning. Hell, even scientists routinely struggle with this stuff. Let's take the red meat issue as an example. It's true, but a lot of those studies were looking at daily intake of 50g or 100g and results like "25% higher risk of rectal cancer" at the higher end of the estimates. For context, a Costco hotdog is 110g while a Nathan's Hotdog is 48. We're talking about 1-2 hotdogs per day. We're also talking about a percent increase in risk, not a percent risk. The CDC site says approximately 3.9% of men and women will be diagnosed with colorectal cancer. If that's our baseline then a 25% increase is a 4.9% risk. That's a disgusting amount of hotdogs to move from a 4% cancer risk to a 5%. Concerning on a national level but not on a personal. This feeds back to #1 as people are interpreting the news as saying "eating hotdogs makes you likely to get cancer" while people observe heavy hotdog eaters around them not getting cancer. Their observation wouldn't run counter to what the research says but it will against the narrative on the news. The incongruence between observation and understanding does justify mistrust. But there's just more ways to misinterpret something than there are to interpret correctly (relates to [2]). This failure mode becomes self-reinforcing. Enough that I think anyone that spends any time on the internet will be aware of it. (Communicating is fucking hard, communicating accurately is even harder)

3) (Perhaps the worst part) Scientists are primarily measured by their citations (count or "h-index"[3]). Unless you do something groundbreaking[4] (which is rare) then this is the main way to "measure" performance. A great way to boost citations is getting media attention. Unfortunately there's just a lot of papers published and a primary driver of citation count is knowledge of a paper's existence. You don't need to be an Avi Loeb type (it doesn't hurt) when we're talking about small numbers. If a Cal State grad student and a MIT grad student were to publish the same paper we'd expect the latter to have more citations due to the latter's greater visibility. MIT has a media wing and these papers are much more easily picked up by larger news orgs. This is why so many scientists use platforms like Twitter. Because your work doesn't mean anything (to your personal success and ability to continue doing your work) if you can't get enough citations. There's an obvious slippery slope here... One that can create a feedback loop to misreporting. The fiercer the competition the the more risky this situation becomes. It's really easy to do slight embellishments of your work. No one is checking at time of publication. Replication happens later and the system devalues replication. Plus, while replicating it is much easier to assume you've made a mistake rather than the paper was in error (or in serious error).

All this is to say that shit is messy. And I don't think any of it is particularly any one person's fault. More an emergent phenomena through compounding effects. Little things here and there add up as we talk about millions of events and many years. I know we all want things to be simple, and simplicity has a lot of benefits, but it also can be a big trap. "As simple as possible, but no simpler" does not mean something isn't extremely complex[5]. It's a trap that makes people think they can read a few lines from Wikipedia and understand something (read the whole article, it's still not enough). A trap with growing consequences to a world that grows in complexity[6]

[0] And I don't think w̶e̶ they should. Papers are a peer-to-peer communication network. Open and visible, but that's how the peer-to-peer communication takes place. Expert-to-public communication has traditionally been done through news or other science communicators. Asking scientists to write papers to the general public is like asking you to communicate to your coworker about your code as if your coworker knows nothing about code or the context it is running in (all because a layman may overhear). Good luck getting any work done...

[1] While news orgs and science communicators (especially pop sci communicators... ugh...) are doing harm here there are defenses anyone can take. Recognize your understanding is always wrong to some degree. Don't take in information as binary true/false statements but probabilities: e.g. likely true/maybe true/maybe false/likely false. Fundamentally the reason this is a good defense is because it is always a more accurate interpretation. Scientists don't find truth through confirmation but through negation. What I mean is w̶e̶ they rule things out. A scientist converges to truth[2]

[2] This also helps you sniff out conmen from the scientists. The scientist always has some doubt. At first they may show themselves as highly confident but as you press on detail they start weakening language. This isn't foolproof and isn't gonna work for every question, but it is common. Scientists are being more trained on media literacy because there is recognition that while this is the right way to talk to peers it gives the public a sense that they lack expertise rather than are aware of complexity. The best signal is just getting them to talk about their domain. They won't stop and will get very detailed.

[3] Number of papers with greater than N citations. An h-index of 10 is having 10 papers with >= 10 citations. h-index of 100 is 100 papers with >= 100 citations.

[4] If you do something groundbreaking no one gives a shit about citation count. But doing something groundbreaking will surely make your citation count skyrocket (often it also drives your h-index too, as you've simply gained more attention and more people are reading your other works. Your work doesn't change, but visibility does). This fact is often used to justify the usage of citation metrics. Citation metrics are fine, but they're also easy to hack and highly context driven. I mention Avi Loeb, and controversy is beneficial to this metric. Every paper that cites him to say he's wrong is a point for him. Controversy is a way to gather points from a whole new source! Not those building on your work, but those building against your work.

[5] "If you can't explain it simply, you don't understand it well enough" is laughable phrase. The reason you can't teach "a barmaid" Quantum Chromodynamics isn't because you don't understand it. You can't explain it "simply" because you don't understand it. You can't explain it simply because you can't even use the word "color" without a layman thinking a quark is red (can you even get into how it is impossible to have "red" at that scale?).

[6] Progress necessitates an increase in complexity. Look at a Taylor Expansion and it's relationship to computational difficulty. I'll let you all figure this out, my comment is already too long.

4rt · 26m ago
thank you for your service, it was a very long comment but i read it all and found it insightful!
godelski · 14m ago
Thanks for reading. Topic hits close to home for me lol
didibus · 2h ago
I think the original source is a 2006 Gallup interview with the researcher Gloria Mark you can read here: https://news.gallup.com/businessjournal/23146/too-many-inter...

> GMJ: How long does it take to get back to work after an interruption?

> Mark: There's good news and bad news. To have a uniform comparison, we looked at all work that was interrupted and resumed on the same day. The good news is that most interrupted work was resumed on the same day -- 81.9 percent -- and it was resumed, on average, in 23 minutes and 15 seconds, which I guess is not so long.

6LLvveMx2koXfwn · 2h ago
What was the bad news?
didibus · 2h ago
The full interview is all in the link. But specifically the bad news was:

> But the bad news is, when you're interrupted, you don't immediately go back to the task you were doing before you were interrupted. There are about two intervening tasks before you go back to your original task, so it takes more effort to reorient back to the original task. Also, interruptions change the physical environment. For example, someone has asked you for information and you have opened new windows on your desktop, or people have given you papers that are now arranged on your desk. So often the physical layout of your environment has changed, and it's harder to reconstruct where you were. So there's a cognitive cost to an interruption.

kehvyn · 3h ago
I think the anticipation of interruption caused by meetings might be worse, I end up losing a half hour on both ends.
Cerium · 2h ago
Oh how I hate a last minute rescheduling of a meeting. Feeling like I only have 30 minutes, I didn't start anything deep. Such a waste.
weikju · 2h ago
This is what kills my days. Other interruptions from coworkers usually are on topic and it’s always a pleasure to help out.
SoftTalker · 1h ago
Yep. For me, a meeting is half a day lost.
godelski · 1h ago
It's interesting to me to see so many people here responding to the title or how many that "read" the article are making small quips.

Interesting because it is an active demonstration of their entire point.

thomasfedb · 2h ago
If it was actually 23mins, and not modifiable, then a myriad of important professions would be completely unviable (e.g. medicine). That is to say, it seems doubtful that the impact of interruptions can be meaningfully summarised in a single figure.
byronic · 37m ago
I actually thought this was going to reference the (earlier) 2000 Spolsky post (point 8 from https://www.joelonsoftware.com/2000/08/09/the-joel-test-12-s...), which is itself dependent on the 15 minute per-person interruption cost (higher than 23m15s in aggregate time)
glitchc · 3h ago
I've personally come to the conclusion that the novelty of the thought process is a big factor in recovery. Simply put, if I reach a conclusion that takes a rather unusual road through my mind, it's much harder to get back to after an interruption.
RossBencina · 1h ago
A search for "Gloria Mark 23 minutes" is interesting reading.

At this point I would suggest going to the source, establish contact with Gloria Mark or a relevant student or co-author and ask whether Dr Mark can confirm that it is an accurate quote, and if so, whether it is a published result. One approach might be to develop the enquiry through a potentially sympathetic third person such as Cal Newport.

didibus · 1h ago
This is the source: https://news.gallup.com/businessjournal/23146/too-many-inter...

Gloria Mark said it in an interview in 2006.

apercu · 3h ago
I’ve been saying for years that an interruption costs me _at least_ 15 minutes.

Knowledge work is not the same as physical work. Both are noble in my opinion, but not the same.

sublinear · 3h ago
I think interruptions are similar for both types of work.

Physical work does require some concentration as well, but imagine on top of that having to take off all your gear and walk into some makeshift office on site, deal with whatever bullshit they're bugging you about, and then go back out to your spot and get ready all over again.

Interruptions for any reason other than a true emergency is just poor planning caused by bad management.

apercu · 1h ago
Fair, but I guess I meant if I am moving tables around and someone asks me a question and I pause and answer I lose 10 seconds. If I’m deep in a much more complex problem I get a little derailed and almost have to start over.
sublinear · 33m ago
Sure, but what if the person moving the tables is in the middle of a larger logistical problem?

Caterers and guests are coming. More interruptions in the form of calls, texts, and emails don't stop and each is also "just 10 seconds".

I think it's pretty rare to find jobs where your role is so clearly defined that all you have to do is move tables. Most work asks that you solve a high level problem nobody else wants to deal with. You probably weren't asked to move tables. You were more likely asked to coordinate a venue for a wedding or something. The people assigned to you who were told they'd only have to move tables end up not finding them. Interrupting them is just as unacceptable because now they have to rush to home depot to buy them at the last minute and they're out of billable hours. They deliver the new tables and now you're the one moving them yourself.

Interruptions suck for everyone because there are always leaky abstractions and messy dependency trees. People incorrectly assume some details are trivial and factoring out the pain points is at least discouraged if not considered insubordination. Bad management and bad planning are everywhere.

ChrisMarshallNY · 2h ago
Reminds me of the Jick Study[0], mentioned in Dopesick.

[0] https://en.wikipedia.org/wiki/Addiction_Rare_in_Patients_Tre...

itsdrewmiller · 3h ago
Maybe someone should just ask Gloria Mark?
ungreased0675 · 2h ago
I’m not finding it in a quick search, but I believe I’ve read something by Mihaly Csikszentmihalyi about the time needed to get into a flow state after being interrupted.
lttlrck · 2h ago
This is adjacent to the post but most (software) engineers I have interacted with are amazing plate spinners and an interruption is just another (ephemeral) plate to spin and it's not even close to 20 minutes recovery time.

Unless it's an emergency (boohoo it'll take whatever it takes) or it tickles my fancy more than what I'm doing - which is a me problem.

dgunay · 1h ago
When some of those plates are unnecessary, it causes problems. I may be responsible for 3 plates worth of work, and be capable of 6 on a really good day. On a bad day though, 3 may be all I can handle and an interruption=dropped plate.
nashashmi · 2h ago
Someone yelling at me costs me 4 hours on a good day.
throwaway346434 · 2h ago
From: https://ics.uci.edu/~gmark/CHI2005.pdf (sample size: 1x company, n=24, lots of limitations discussed at end of paper)

"When people did resume work on the same day, it took an average length of time of 25 min. 26 sec (sd=54 min. 48 sec.). This may seem like a relatively short amount of time, but it is also important to consider that before resuming work, our informants worked in an average of 2.26 (sd=2.79) working spheres. Thus, people’s attention was directed to multiple other topics before resuming work. This was reported by informants as being very detrimental. In some cases, the physical or desktop environment is restructured, which makes it more difficult to rely on cues to reorient one to their interrupted task. For example, a blinking cursor at the end of the last typed word can enable one to immediately reorient to that document, whereas if other windows have been opened, it can be hard to remember even which document had been worked on."

And "We found a trend that showed more externally interrupted working spheres are resumed on the same day (53.3%) compared to internally interrupted working spheres (47.6%), X2 (1)=2.97, p<.09. Externally interrupted working spheres are resumed on the average in a shorter time (22 min. 37 sec., sd=53 min. 52 sec.) than internally interrupted working spheres, (29 min. 1 sec., sd=55 min. 43 sec.), t(987)=1.92, p<.055."

So no, it does not say 23 minutes and 15 seconds in that paper.

But to say: "the paper never goes into details regarding the recovery time between finishing the interruption and getting back to the original task." is flat out incomplete, because they are reading the followup paper to the original work in isolation; and haven't considered that a number of reports summarized the findings of that (22 m 37s) as "about 23 minutes". The way it is written implies the research is all wrong, rather than more accurately stating "I can't find the exact source of a quote but it's broadly 22-23 minutes, not 23m15s afaict".

There is also some irony in "ctrl+f", "23" being explained as the methodology for review on the topic of attention span for complex tasks...

godelski · 2h ago

  > The way it is written implies the research is all wrong
I think you read the words from the article but I think you missed their entire point. I think you're actually demonstrating their thesis...