What a 1 minute timer is for
One minute is the unit of quick discipline: a plank, a rinse, a breathing exercise, the elevator-pitch rehearsal. The page loads with the countdown already set, so the whole interaction is one click.
The timer runs on the browser clock, not a server, so it works offline once the page is open and it keeps counting in a background tab. At zero it plays a short chime; keep the tab unmuted if you plan to walk away.