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Twenty minutes is a popular length for a power nap and for independent reading time. Press Start to begin, or Show full screen to put the countdown on a TV, projector or propped-up phone. When time's up, the screen flashes and beeps.
The timer keeps counting if you switch tabs or refresh the page. Need a different length? Use the minute buttons or set a custom time.
Many people find around 20 minutes refreshing without waking up groggy.
Set the timer for independent reading in class or at home.
Work for twenty minutes, take a short break, repeat.
1 Minute, 2 Minutes, 3 Minutes, 5 Minutes, 10 Minutes, 15 Minutes, 25 Minutes, 30 Minutes, 45 Minutes, 1 Hour. For a clock or stopwatch, open the big clock.
Space starts and pauses. R resets. F shows it full screen, and Esc comes back.