The 25/5 pomodoro is the original interval: 25 minutes of focused work on one task, then a 5-minute break, repeated four times before a longer break of 15 to 30 minutes. Francesco Cirillo set those numbers in the late 1980s with a kitchen timer, and they’ve barely moved since.
Where the numbers came from
Cirillo was a student in Italy who couldn’t concentrate for long. He wound a tomato-shaped kitchen timer and bet himself he could manage a short block of honest study. The number settled at 25 because it was long enough to get somewhere and short enough that he’d agree to start on a bad day.
That second property is the one people miss. Twenty-five minutes isn’t optimised for attention span. It’s optimised for negotiability. There’s a full account on our why 25 minutes page.
Who it suits
People whose problem is starting. If you know exactly what to do and still can’t begin, a 25-minute commitment is small enough to accept. Fifty is not, on the days it matters.
Study and revision. Flashcards, closed-book recall, reading a section and summarising it. All of this starts instantly and fits the unit without being cut in half. More on that in pomodoro technique for studying.
Admin and email. Work that has no warm-up and expands to fill whatever time you give it. A 25-minute box around the inbox is one of the highest-return uses of the whole method.
Anyone rebuilding the habit. After a bad week, 25/5 is the easiest thing to restart.
Who it frustrates
Anyone whose work has a warm-up. If you spend the first twelve minutes rebuilding a problem in your head, the bell at minute 25 arrives just after you got useful, and you pay that setup cost again next session. Debugging, restructuring a long document, and unfamiliar maths all behave this way. Move to 50/10.
It also frustrates people who reach deep concentration easily and hate being pulled out of it. That’s what flowtime exists for.
How to run it
- Write the task down. One task, stated in a short phrase. “Draft section 2”, not “the report”.
- Start the 25 minutes.
- Work on that only. Anything unrelated goes on a scrap list, one line, no detail.
- Stop when it rings, even mid-sentence. An unfinished sentence is the cheapest possible place to resume.
- Take the 5 minutes standing up and away from the screen. Time the break too, or it becomes twenty.
- After four sessions, take 15 to 30 minutes properly.
If you’re interrupted and can’t deflect it, the session is void. Don’t pause and resume; start a fresh one. The rule makes stopping feel expensive, which is the point.
A worked block
Four sessions of 25/5 with a 15-minute long break take 1 hour 55 minutes. Start at 9:00 and you’re done by mid-morning with four protected sessions behind you.
Two of those blocks, morning and afternoon, is a strong day. That’s eight sessions, and eight is more real focus than most people manage in a nine-hour day without structure. See how many pomodoros per day for the ceiling.
When to move on
Watch what happens at the bell for a few days.
Mid-flow every time? Your warm-up is longer than the interval. Go to 50/10, or 52/17 if you also keep skipping breaks.
Never getting there? Go shorter. Run 15-minute sessions until finishing them stops being in doubt, then climb back up. A finished 15 beats an abandoned 25.
It works fine? Leave it. People change ratios because switching feels like progress, and it usually isn’t.
Other options, with totals for each, are on pomodoro intervals.
FAQ
What does 25/5 mean in the pomodoro technique?
Twenty-five minutes of uninterrupted work on one task, followed by a 5-minute break. After four of these you take a longer break of 15 to 30 minutes. It’s the original ratio from Francesco Cirillo and still the most widely used.
Why is the pomodoro 25 minutes and not 30?
Cirillo arrived at 25 experimentally as a student, not by rounding. Twenty-five is short enough to agree to when you’re avoiding the task and long enough to make real progress, and four of them plus breaks fits neatly into a two-hour-ish block.
How many 25/5 pomodoros are in an hour?
Two, exactly. Two work sessions and their two breaks fill an hour with nothing left over, which gives you 50 minutes of protected work per hour if you take both breaks. Four sessions with a long break at the end take 1 hour 55 minutes.
Should the long break be 15 or 30 minutes?
Cirillo’s published range is 20 to 30 minutes. Fifteen is the common default and works if you actually leave the desk. If you’re running four-session blocks all day, use the longer end, because the long break is what makes the afternoon block possible.
Is 25/5 good for ADHD?
It helps many people, mostly because a short, visible commitment lowers the cost of starting. Others find 25 minutes too long at first and do better at 10 or 15, building up over a few weeks. Pomodoro technique for ADHD covers the adjustments.
Run the original: start a 25/5 session with a long break after four.