Ninety seconds — a minute and a half — 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 ninety seconds 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.
A 2 minute 15 second timer — 2:15, for a recipe step, a steeping tea, or a focused window. Repeats as many times as you set.