25/5, 50/10, 52/17: one afternoon, three rhythms
Arguments about Pomodoro lengths usually compare ratios. 25 minutes on and 5 off is five to one; 52/17 is about three to one, so it must be “more rest”. That’s true per cycle and close to useless for planning a day, because you don’t work in cycles. You work in whatever gap you’ve got before the next class, meeting or dinner, and the last block has to fit in it.
So instead of arguing, we ran the three most common rhythms through the same code Pomo uses to run a session, for the same afternoon, and looked at what came out.
The setup
Every schedule on this page is computed, not typed. The site has a copy of Pomo’s timer engine (it’s what drives the web timer), and a small planner that presses Begin the moment each break ends and stops before any focus that wouldn’t finish inside the window. A schedule never ends on a break. The three rhythms, as you’d set them in Pomo’s Session settings:
| Rhythm | Focus | Short break | Long break | Long break after |
|---|---|---|---|---|
| 25/5 | 25 min | 5 min | 15 min | 4 sessions |
| 50/10 | 50 min | 10 min | 10 min | 4 sessions |
| 52/17 | 52 min | 17 min | 17 min | 4 sessions |
25/5 is Pomo’s default, long break and all. For the other two, the long break is set to match the short one, because neither rhythm has a long break and Pomo always takes one.
One afternoon, 1:00 to 5:00 pm
At 25/5:
| Phase | From | To | Length |
|---|---|---|---|
| Focus | 1:00 pm | 1:25 pm | 25 min |
| Short break | 1:25 pm | 1:30 pm | 5 min |
| Focus | 1:30 pm | 1:55 pm | 25 min |
| Short break | 1:55 pm | 2:00 pm | 5 min |
| Focus | 2:00 pm | 2:25 pm | 25 min |
| Short break | 2:25 pm | 2:30 pm | 5 min |
| Focus | 2:30 pm | 2:55 pm | 25 min |
| Long break | 2:55 pm | 3:10 pm | 15 min |
| Focus | 3:10 pm | 3:35 pm | 25 min |
| Short break | 3:35 pm | 3:40 pm | 5 min |
| Focus | 3:40 pm | 4:05 pm | 25 min |
| Short break | 4:05 pm | 4:10 pm | 5 min |
| Focus | 4:10 pm | 4:35 pm | 25 min |
At 50/10:
| Phase | From | To | Length |
|---|---|---|---|
| Focus | 1:00 pm | 1:50 pm | 50 min |
| Short break | 1:50 pm | 2:00 pm | 10 min |
| Focus | 2:00 pm | 2:50 pm | 50 min |
| Short break | 2:50 pm | 3:00 pm | 10 min |
| Focus | 3:00 pm | 3:50 pm | 50 min |
| Short break | 3:50 pm | 4:00 pm | 10 min |
| Focus | 4:00 pm | 4:50 pm | 50 min |
At 52/17:
| Phase | From | To | Length |
|---|---|---|---|
| Focus | 1:00 pm | 1:52 pm | 52 min |
| Short break | 1:52 pm | 2:09 pm | 17 min |
| Focus | 2:09 pm | 3:01 pm | 52 min |
| Short break | 3:01 pm | 3:18 pm | 17 min |
| Focus | 3:18 pm | 4:10 pm | 52 min |
Over four hours, 50/10 gets you the most focus, 200 minutes, and 52/17 the least, 156, with 50 minutes left over that can’t hold a fourth block. 25/5 sits in between at 175, but in seven pieces. That’s seven times you start from cold, against four or three.
Now change the length of the afternoon
Here is the same comparison for gaps from an hour and a half to eight hours:
| You have | 25/5 | 50/10 | 52/17 |
|---|---|---|---|
| 1 h 30 min | 75 min3 blocks | 50 min1 block | 52 min1 block |
| 2 h | 100 min4 blocks | 100 min2 blocks | 52 min1 block |
| 3 h | 125 min5 blocks | 150 min3 blocks | 104 min2 blocks |
| 4 h | 175 min7 blocks | 200 min4 blocks | 156 min3 blocks |
| 5 h | 225 min9 blocks | 250 min5 blocks | 208 min4 blocks |
| 6 h | 275 min11 blocks | 300 min6 blocks | 260 min5 blocks |
| 8 h | 375 min15 blocks | 400 min8 blocks | 364 min7 blocks |
Two things jump out.
In short gaps, the short rhythm wins outright. With an hour and a half, 25/5 fits three blocks, 75 minutes, while 50/10 and 52/17 fit exactly one long block each and leave the rest of the gap empty. At two hours, 25/5 and 50/10 tie at 100 minutes. Long blocks only start paying off once the gap is long enough that their leftover stops mattering.
52/17 never comes first. In every window we tried, the 17-minute break costs more focus than the two extra minutes of each block win back. That doesn’t make it a bad rhythm (seventeen minutes is long enough to actually go for a walk, which a five-minute break isn’t), but if your reason for picking it is getting more done, the arithmetic doesn’t back you. Its origin doesn’t either: it describes what one company’s most productive users happened to do in 2014, and the same company found 112/26 when it looked again (see the 52/17 timer page for the sources).
Picking a rhythm for the gap you have
The useful question isn’t “which ratio is best” but “what fits the time before I have to stop”. Some rules of thumb from the numbers above:
- Under two hours: 25/5. A long block leaves a hole at the end. (At exactly an hour it’s a wash: two 25s or one 50 or 52.)
- Two to five hours: 50/10, if your work survives 50-minute stretches. If you’re glazing over by minute 40, the extra focus is only on paper.
- When the break itself matters: 52/17, knowing you trade some focus time for breaks long enough to leave the room.
You don’t have to commit for the whole day, either. Pomo’s presets under the face jump between 15, 25 and 50 for the next session, and dragging the face changes it a minute at a time. A long block after lunch and short ones in the hour before a class is a perfectly good day.
If you want to try one without installing anything, each has a timer on this site: 25 minutes, 50/10 and 52/17.