PomodoroWhat a 90 minute session is for
Some work only happens in a long, unbroken stretch: designing a system, drafting a difficult chapter, working through a proof, building a financial model, studying a hard new topic from first principles. For such work, many people prefer one long session to several short ones. Ninety minutes is a common choice: long enough to go deep, and about as long as most people can hold full attention without a rest.
Use it sparingly
This is not a rhythm for the whole day. Two long sessions, or three at the very most, are what most people can do with real concentration. The rest of the day is better spent on lighter work in shorter rounds: email, routine practice, revision, planning. A realistic day might be: one 90 minute session in the morning, a second before lunch, and ordinary 25 minute rounds in the afternoon.
Prepare before you start
A long session is expensive to waste, so set it up:
- One problem, chosen and written down the night before.
- Everything open: files, books, data, references. No searching once you begin.
- Phone in another room, notifications off, door closed, people told.
- Water on the desk, and a visit to the washroom first.
- Your best hours. For many that is early morning, before the day's messages begin.
Inside the session
Expect the first ten to fifteen minutes to feel slow; that is the warm-up, not a sign that the session is failing. In the middle, if you notice that you have been stuck on one point for a long time, stand up for a minute without touching any screen, then return and try a different approach. Keep a sheet beside you for stray thoughts, as described on the interruptions page. Stop at the bell. Going beyond 90 minutes without a break usually gives little and takes a lot from the rest of the day.
The break must be real
Twenty minutes, away from the desk, without a screen: a walk, a meal, a wash, a stretch, a quiet sit. This is not the time for messages. If you fill the break with more information, the second session will be a shadow of the first.
| Sessions | Focus time | Clock time with breaks |
|---|---|---|
| 1 | 1 h 30 min | 1 h 30 min |
| 2 | 3 h | 3 h 20 min |
| 3 | 4 h 30 min | 5 h 10 min |
Is it for you?
If you are new to timed work, start with 25 minutes; a 90 minute promise is hard to keep and discouraging to break. If you already work well in 50 minute rounds and want one deeper stretch a day, this is the next step. Students practising full-length papers will find the long session useful too, though a real mock test should be sat at the examination's own length. More on choosing a rhythm is on the deep work and flow page.
Questions people ask
Why 90 minutes?
It is a common length for deep work: long enough to get well into a hard problem and short enough to stay attentive. It is a practical convention, not a law; 75 or 100 minutes may suit you as well.
Can I do 90 minute sessions all day?
Most people manage two or three. Plan lighter work in shorter rounds for the rest of the day.
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