A minute and a half — ninety seconds — is one of the most useful short lengths there is. It is a common microwave setting, a board-game turn, the time to let something steep or cool, and the standard rest between heavy sets at the gym. Whatever the task, 1:30 tends to be the right amount of not-too-short, not-too-long.
Counting rounds rather than one-offs, the math is tidy: eight rounds of a minute and a half is a twelve-minute block. Open the editor and set how many rounds to run.
A 75 second timer — a minute and a quarter, a useful in-between length. Repeats for your chosen rounds.
The two minutes dentists mean by “brush properly” — and equally the window for a clay face mask, a plank you are working toward, or a capped brainstorm. A clear countdown you can read across the room.