You block off two hours for focused work, then a Slack message comes in. Then a quick question at your desk. Then a calendar invite for a meeting that only takes 15 minutes.

By the time you add it up, the deep work block never really happened.

What Interruptions Actually Cost

Research from the University of California, Irvine found that after an interruption, it takes an average of over 20 minutes to return to a task at the same level of engagement. That’s not just the time you spent answering the question, but also the recovery time afterward.
Fragmented attention is both inefficient and tends to feel more exhausting than sustained focus, because you’re repeatedly paying the cognitive cost of re-entering a task rather than staying in it.

Deep, concentrated work is a limited resource. It benefits from protection.

3 Boundary Scripts To Use

• “I’m in a focus block until [time], can I come back to you then?” You’re not saying no; you’re saying when.
• “I check messages at [time] and [time] — if it’s urgent, call me.” Set an expectation for response times so people stop treating your inbox as a live chat window.
• “I work better on this kind of task first thing, can we move the meeting to after lunch?” A gentle way to protect your peak cognitive hours without framing it as a complaint.

Structure Your Environment, Not Just Your Calendar

Boundary scripts help, but your setup matters too. Phone face-down, notifications off on your computer, and a visible signal such as headphones, a closed door, or a status set to Do Not Disturb, reduce the awkwardness of having to say anything at all.
The goal is to create enough uninterrupted time to do work you’re actually proud of.

Reflection: When was the last time you had two uninterrupted hours of focused work, and what made it possible?