How to Get Back on Task After an Interruption

You were halfway through a budget spreadsheet, finally holding all the numbers in your head, when a colleague leaned over to ask where the shared folder lives. It took ninety seconds to answer. Twenty five minutes later you are replying to an email you had not planned to touch, the spreadsheet is still open in another tab, and you cannot remember which column you were checking.

The interruption was short. Getting back was the expensive part. Most advice about focus is about preventing interruptions, which is fine if you work alone in a cabin. If you have a manager, children, a support inbox or a phone that rings, you will be interrupted many times a day no matter what you do. So the more useful skill is re-entry: getting back into the task quickly once the interruption is over.

Why the way back takes longer than the detour

Gloria Mark, who studies attention at the University of California, Irvine, spent years shadowing office workers. One figure from her research gets quoted everywhere: after an interruption, people took on average about 23 minutes to get back to the original task. That number is often misread. It does not mean your brain needs 23 minutes to reboot. It means that, in practice, people rarely went straight back. They detoured through two or more other tasks first, because the interruption reminded them of something else, and that thing reminded them of something else again.

The second piece comes from Sophie Leroy, a management researcher who coined the term attention residue. When you leave a task unfinished, part of your attention stays with it. And when you return, part of your attention is still with the interruption. You are physically back at the spreadsheet, but your mind is still half in the folder question and the email it triggered.

Put those together and you get the real problem. The cost is not the ninety seconds. It is the drift afterwards, plus the effort of rebuilding the mental picture you had before.

The one habit that reduced my drift most

A few years ago I counted my interruptions for a full Tuesday with tally marks on a sticky note. There were fourteen. Nine of them lasted under three minutes. But by the end of the day, I had finished one of the three things I had planned, and the reason was obvious when I looked back: almost every short interruption was followed by a long wander.

The fix I settled on comes from a later study by Leroy and Theresa Glomb. They found that when people paused before switching and wrote a quick plan for where to pick up, attention residue dropped noticeably, and they did better on the interrupting task as well. They called it a ready to resume plan. I call mine a parking note, because it is the mental equivalent of noting which level you left the car on.

It takes about twenty seconds and has three parts:

1. Where I am. One line, specific. "Checking Q3 travel column, rows 40 to 62."
2. The very next physical action. Not "finish budget" but "compare row 41 against the taxi receipts folder."
3. The open question. Whatever you were about to figure out. "Why is September $212 higher than August?"

You write it before you turn to the person or open the message, on paper or in a scratch file. Most people, in my experience, can ask a colleague to wait the length of one sentence, and a quick "one second, let me save my place" is usually received well. When it is your manager or your child and you truly cannot pause, write the note the moment the interruption ends, before doing anything else.

What to do when you sit back down

Read the note, then do the next physical action within a minute. Do not check the inbox "quickly" first. The step is deliberately small so that starting costs nothing. Once you have compared row 41, the rest of the picture usually reloads on its own, because you are working inside it again rather than trying to remember it.

The advice I would not take: kill every notification

Plenty of focus guides tell you to turn on Do Not Disturb, close your email and never answer the door during deep work. I agree with part of that. Notifications from apps you do not need for your current task should go. But blanket advice to make yourself unreachable falls apart for a nurse, a team lead, a parent working from the kitchen table, or anyone whose job is partly to be available.

Trying to wall yourself off and failing tends to feel worse than accepting some interruptions and getting good at re-entry. I would rather plan for six interruptions a morning and lose five minutes to each than pretend there will be none and lose the whole morning when the first one lands. Esme makes the case for protecting attention in focusing in a world built to distract you; I see re-entry as the other half of the same job.

A useful middle ground is to sort the interruptions you get into two piles. Some are urgent and must be answered now. Many are not, they just arrive in person, so they feel urgent. For the second pile, a phrase like "can I come to you at 11:30?" works surprisingly often, and you can write the parking note while they walk away.

Interruptions you cause yourself

Mark's research also found that people interrupt themselves roughly as often as others interrupt them. You switch to check a price, a message, a news headline, and the same drift follows. The parking note works here too, but there is an easier version: before you open a new tab for something unrelated, write the thing you wanted to check on a "later" list beside your keyboard. Most of those items turn out to be fine to batch at lunch. If your later list keeps growing faster than you can clear it, that may be a sign your task list itself is the problem, which we covered in why most to do lists fail by lunchtime.

I cannot promise this gives you back the full 23 minutes every time. Some interruptions are emotionally loud, a bad email or a worrying call, and no note will make you care about a spreadsheet straight afterwards. On those days, a five minute walk before trying again has worked better for me than forcing it.

Try it for one day this week

Put a stack of sticky notes or a blank text file next to your main work window. Tomorrow, every time someone or something interrupts you, write the three line parking note before you respond, or immediately after if you cannot. Add a tally mark each time. Before you log off, look at how many interruptions you had and how many times you went straight back to the next action instead of wandering. That one number will tell you more about your focus than any app. More ideas along these lines are collected in our focus section.