The Pomodoro Technique: what the 25 minutes really are

Where the 25 minutes come from

In his original paper Cirillo describes the classic unit as 25 minutes of work plus a short break. He writes that the ideal Pomodoro is about 20 to 35 minutes, 40 at the most, and that very short ones, such as 10 minutes, don't give appreciable results. That is a practitioner's experience, not a laboratory finding. No study has shown that human attention runs out at exactly minute 25.

So treat 25 minutes as a sensible default. If you are writing code or an essay and keep getting cut off just as you warm up, try 40 or 50 minutes. If a boring task makes you fidget after 10, start with 15 and build up.

What research does support: one task at a time

The strongest evidence behind the method is about switching. In experiments by Rubinstein, Evans and Meyer, summarised by the American Psychological Association, people lost time every time they switched between tasks, and they lost more as the tasks got more complex. Each switch costs only a fraction of a second, but the costs add up when you jump back and forth all day.

A Pomodoro is a promise to do one thing until the timer rings. That single rule removes most of the small switches that make a working day feel busy but unproductive.

The rules people forget

Cirillo's method has a few rules that most apps leave out, and they are where much of the value sits:

• A Pomodoro is indivisible: if you abandon it, it doesn't count, and you start a fresh one.
• Mark interruptions instead of acting on them. Cirillo uses an apostrophe for an inner urge ("check email") and a dash for an outside interruption.
• For outside interruptions he suggests "inform, negotiate, call back": say you are busy, agree a time, then return to them after the Pomodoro.
• After four Pomodoros, take a longer break of about 15 to 30 minutes.

How to find your own length

Run a small test for a week. Keep the same task type and try one length per day, for example 25, 35 and 50 minutes. At the end of each session, write two numbers: how many interruptions you marked and how much you got done. The length with the fewest marks and the best output is your Pomodoro for that kind of work.

Setting it up on the timer

On the Pomodoro timer, open Settings and set Focus (minutes), Short break (minutes) and Long break (minutes). "Long break after this many focus sessions" is 4 in Cirillo's method. If you tend to skip breaks, switch on "Start the next phase automatically" so the break starts by itself.