A focus rhythm is a simple agreement with yourself: work on one thing for a set time, then stop for a set time. The numbers vary. The point is the same: a clear start, a clear end, and a break you take before you need it.
Here are the rhythms people use most, what each is good for, and what the evidence behind them is.
The common rhythms at a glance
| Rhythm | Focus | Break | Long break | Good for |
|---|---|---|---|---|
| 25/5 | 25 min | 5 min | 15–30 min after 4 | Getting started, admin, study, tasks you avoid |
| 50/10 | 50 min | 10 min | 30 min after 4 | Writing, coding, design: work with a slow start |
| 52/17 | 52 min | 17 min | none | Long workdays with real recovery between blocks |
| 90-minute blocks | 90 min | 15–30 min | none | Deep work, two or three blocks a day |
| Flowtime | until focus fades | proportional | none | Work where interruptions cost the most |
25/5: short blocks, frequent breaks
Twenty-five minutes of focus, a five-minute break, and a longer break after every fourth focus. It is the most widely used rhythm because it is easy to start: twenty-five minutes is short enough that even a task you have been avoiding feels manageable. Read more in the 25/5 rhythm.
50/10: the same idea, doubled
For work that takes ten minutes to load into your head, a 25-minute block can end just as you get going. Doubling everything keeps the proportions, five minutes of work for every minute of rest, and gives deep work room.
52/17: from one company’s data
The 52/17 figure comes from DeskTime, a time-tracking company, which looked at its most productive users in 2014. It is an observation, not an experiment, and when DeskTime repeated it in 2021 the figure had become 112/26. Read more in the 52/17 rule.
90-minute blocks
Ninety-minute blocks are often tied to the body’s “ultradian” cycles. The evidence for planning work around those cycles is thinner than it is usually presented. Long blocks can still suit deep work, especially when the day has room for only two or three of them.
Flowtime: let the work decide
Instead of a fixed length, you work until your focus fades, then take a break that grows with the time you worked. Read more in Flowtime.
What the research says
The honest summary is that the evidence is mixed, and that is useful to know.
- In a 2023 study with students, Biwer and colleagues found that those who took breaks at will were more fatigued, more distracted and less motivated than those whose breaks were fixed. The amount of work completed did not differ.
- A 2025 experiment by Smits, Wenzel and de Bruin found the opposite on fatigue: students with fixed 25/5 blocks grew tired faster than students who chose their breaks, and productivity did not differ between the three methods tested.
- A 2022 meta-analysis of micro-breaks by Albulescu and colleagues found small but reliable gains in vigor and reductions in fatigue from breaks of ten minutes or less. Effects on performance depended on the task and grew with the length of the break.
So no rhythm has been shown to be best for everyone. Breaks themselves help, a fixed rhythm takes the decision of when to stop off your plate, and flexibility matters when the work is going well.
How to choose
- Start with 25/5 if you are new to working in blocks, or if the hard part is starting.
- Move to 50/10 if the break keeps arriving just as you find your thread.
- Extend instead of breaking when you are in flow, and take a longer break afterwards.
- Keep the long break. After three or four blocks, step away for 15 to 30 minutes.
- Make breaks screen-free. Checking messages is not a break. See screen-free break ideas.
Every rhythm in one menu-bar timer
Tomette offers the classic 25 · 5 · 15 rhythm, an extended 50 · 10 · 30 rhythm, and lengths of your own from 1 to 60 minutes, so 52/17 works too. When you are in flow, add five minutes instead of taking the break, and the next break grows to match.