Three minutes is the round, full stop — a championship boxing or kickboxing round runs exactly three, and the bell is what fighters train against. It is also the original “three-minute egg” for a soft, runny yolk, the length of a quick freewrite to break a blank page, and about as long as a deliberate breathing reset between demanding tasks.
Sparring is rarely a single round, so this repeats cleanly: tell the editor how many rounds you want and each three-minute stretch counts to zero and rolls into the next, with nothing dead in between.
A 2.5 minute timer — 2 minutes 30 seconds, for steeping tea, a recipe step, or a short meditation. Repeats as many times as you set.
A 3 minute 30 second timer — 3:30, about right for steeping black tea or the length of a song. Repeats as many times as you set.