Sixteen minutes is four sets of four, a tidy circuit with no leftover time to fill. Writers can draft one scene. Students can finish one multi-step problem with checking.
Set the alarm before you gather materials. Hunting for a pencil is not part of the sixteen. 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 16 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 16 minutes timer on a projector?
Press start, then F or the fullscreen button. Classroom mode hides the writing so the digits fill the wall. Set the alarm before you gather materials. Hunting for a pencil is not part of the sixteen.
What is 16 minutes actually good for?
Sixteen minutes is four sets of four, a tidy circuit with no leftover time to fill.
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.