Fifteen minutes is the sweet spot for a power nap: long enough to refresh, short enough to wake before deep sleep makes you groggy — and a countdown is what saves you from sleeping into the afternoon. The same quarter-hour is a realistic pre-guest tidy of the main rooms, a single conditioning block at the gym, and about the time a cooked steak wants to rest before you carve it.
Napping in stints, or training in fifteen-minute blocks? Enter a round count in the editor and each quarter-hour counts to zero and starts over, two rounds covering a half-hour session without a second glance at the clock.
Ten minutes is enough to finish something — a declutter blitz, a short bodyweight workout, ten minutes of ice on a strain, or an inbox sweep. A big countdown to the finish, stackable for longer sessions.
An 18 minute timer — the length of a TED talk, and a tidy focus sprint. Repeats as many times as you set.