About this timer
20 minutes = 1,200 seconds = 0.33 hours.
Nothing runs until you press Start. Pause keeps the time left; Reset goes back to 20 min. Full screen shows only the ring, the time and the buttons, for a projector or a shared screen. Choose a chime, a beep or a bell and press Preview to hear it before you start.
The timer counts from your device clock, so a slow tab catches up instead of drifting. Keep the tab open: a phone that locks or a laptop that sleeps can hold back the sound until it wakes.
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