Thirty-two minutes is a power of two, which splits cleanly into halves down to two minutes if you need stations. A language drill fits: listen, repeat, speak, then a short recap.
Protect the last two minutes for cleanup so the next person inherits a clear table. Press space to start or pause, R to reset, and F for fullscreen. The screen can stay awake after you start, using the wake lock your browser allows. Pick the alarm before you begin. A bell, a chime, a beep, or a short digital pulse all come from the Web Audio API, so there is no sound file to wait on.
This page is the 32 minutes countdown and nothing else is running underneath it. Related lengths are linked under the guide if you want a neighbor, and the timer itself stays above the fold.
Questions
How do I run a 32 minutes timer on a projector?
Press start, then F or the fullscreen button. Classroom mode hides the writing so the digits fill the wall. Protect the last two minutes for cleanup so the next person inherits a clear table.
What is 32 minutes actually good for?
Thirty-two minutes is a power of two, which splits cleanly into halves down to two minutes if you need stations.
Will the countdown drift if I switch tabs?
No. The end is a timestamp. The display is the gap between that timestamp and now, so a background tab does not lose seconds the way a ticking counter would.