The Pomodoro Technique for Long Study Sessions

The Pomodoro technique is simple: work on one thing for 25 minutes, take a short break, and take a longer break after four rounds. It helps with starting work and with not drifting away from it. It does not tell you what to study or how, and for some kinds of work a fixed 25-minute timer gets in the way. This post covers the rules as its inventor wrote them, what the research says, and how to adapt it for long study sessions.

What the Pomodoro technique is

Francesco Cirillo developed the technique in the 1980s, when he was struggling to focus on his university studies. He used a kitchen timer shaped like a tomato, pomodoro in Italian. In his book he says it started as a bet with himself about whether he could really study for ten minutes.

These are the rules as he sets them out in the version of his book he published online in 2007:

1. Choose one task and set the timer for 25 minutes.
2. Work only on that task until the timer rings. If something else comes to mind, write it down and carry on.
3. When the timer rings, stop, even if you could finish in a few more minutes. Take a break of 3 to 5 minutes.
4. After four rounds, take a longer break of 15 to 30 minutes.
5. If you have to abandon a round, it does not count. Start a fresh one.
6. Mark each finished round next to the task, so you can see how many rounds each task actually took.

He also suggests using the first few minutes of each round to recap what you have done on the task so far, and the last few to review it.

What the research says

There is little direct research on the technique, and the results so far are mixed.

• In a study of 87 university students, those who took scheduled breaks (6 minutes after every 24, or 3 after every 12) reported less fatigue and distraction, and better concentration and motivation, than students who chose their own breaks. Those choosing their own breaks studied in longer stretches. There was no difference in how much work either group completed (Biwer et al., 2023).
• A later study of 94 students compared 25/5 Pomodoro breaks with self-chosen breaks and with Flowtime, where you break when you choose and the break length depends on how long you studied. It found no differences in productivity or task completion. Fatigue rose faster in the Pomodoro group during the session, though overall fatigue levels ended up similar (Smits, Wenzel and de Bruin, 2025).

So scheduled breaks may help with how a long session feels, though the two studies do not agree on that, and neither found that they help you get more done.

What it helps with

The timer is useful for three things:

• Starting. 25 minutes is a small enough commitment to agree to even when you do not want to work.
• Interruptions. Once a round has started, anything that comes up gets written down and dealt with in a break or later.
• Seeing how long things take. Counting rounds per task shows how long your work really takes. People tend to underestimate this, and the procrastination calculator explains the research and helps you plan around it.

It does not help you understand anything. What you do during the 25 minutes matters more than the timer.

Work that suits 25-minute blocks

Fixed blocks suit work that divides into small pieces, where stopping at any point costs little:

• flashcards and self-testing;
• a first pass through a section of a chapter, to see what is in it;
• sets of short problems that take a few minutes each, such as dosage calculations or supply-and-demand exercises;
• turning your notes into questions you could be asked;
• small backlogs of terms, formulas, labelled diagrams or dates.

Work that needs longer blocks

Work you have to hold in your head as a whole is different:

• long multi-step problems, such as a proof, a derivation, a full statistics question or an engineering problem with several stages;
• writing, such as an essay paragraph, the discussion section of a lab report or a long exam answer;
• dense reading, such as a journal article, a law judgment or a chapter whose argument only comes together after several pages.

Getting back into a task after a break takes time, and it takes longer if you were stopped in the middle of a step. In a lab study, people who were interrupted between the steps of a task got back to it much faster than people interrupted in the middle of one (Bailey and Iqbal, 2008). A timer does not know where the steps are, so it will often ring in the middle of one.

For this kind of work, use a longer block, or treat the timer as a minimum: when it rings, finish the step you are on, then take your break. That goes against Cirillo's rule about stopping when the timer rings, but a break at the end of a step costs less than one in the middle.

How to take a break

Cirillo's suggestions for the short break are simple: stand up, walk around, get a drink of water, stretch. He advises against anything that takes real mental effort, and against thinking about the work you just did.

Be careful with your phone. In one experiment, people who spent a break on their phone solved fewer puzzles afterwards than people who did the same break activity on paper or on a computer (Kang and Kurtzberg, 2019). A simple rule: do not start anything in a break that has no natural end, such as a social media feed.

How long should a block be?

Nothing in the research above shows that 25 minutes is the best length, and Cirillo himself allows a range. In the same book he puts the ideal between 20 and 35 minutes, and no more than 40, based mainly on his own experience and that of teams he mentored.

Adjust it to the work:

• Shorter, around 10 to 15 minutes, when the hard part is starting. Cirillo began with a ten-minute bet.
• Longer, up to Cirillo's 40, for problem sets, writing and anything that takes a while to get into. Past 40 minutes you are no longer following his method.
• A useful target is a block a little shorter than the point where your attention usually drifts, and a little longer than one natural unit of the work.

To find your own numbers, note for a week when you stopped and why. The length that suits a problem set will probably not suit a reading session.

Common mistakes

• Counting rounds instead of progress. If the number of rounds becomes the goal, you start choosing work that fits neatly into rounds. Flashcards fit. The problem set you do not understand does not. Decide what each round is for before you start it, and judge the day by what you covered. In SymbioLearn, Today can help with that decision: it lists the Concepts in your Module that most need attention, each with a plain reason, such as a review being due.
• Working in long stretches without planned breaks. In the first study above, students who chose their own breaks worked in longer stretches, reported more fatigue, and got no more done.

How to try it this week

1. Before your next study session, list your tasks and mark each one as short (flashcards, short problems, a first read) or long (a multi-step problem, an essay, dense reading).
2. Do the short tasks in 25-minute rounds, with a 3 to 5 minute break after each and a longer break after four.
3. Give each long task one longer block. When the timer rings, finish the step you are on, then stop.
4. After each round, note how many rounds the task has taken and when your attention went.
5. After a week, set your own block lengths from those notes.