Half an hour, on a bar
This page opens with the Bar display: the digits above a progress bar that empties from right to left. On a wide screen or a projector it reads like a progress bar in any app, and it leaves room around it for instructions on a shared screen. Switch to Ring, Pie or Numbers only under Display and sound.
A ping plays at five minutes left, then the alarm rings at 0:00 until you stop it (or for a minute). After that the status line counts the overtime.
Tests and exams
For a timed test, put the timer in full screen (press F) on the projector before the first question. Write what the time is for in the label box (Section B), and it appears above the digits. The five-minute ping is the usual cue to check answers. If students start late, press + to add a minute for each minute lost; the timer adds it to the running countdown.
Exercise and lunch
The CDC recommends that adults get 150 minutes of moderate-intensity activity a week, for example 30 minutes a day on 5 days, plus muscle strengthening on 2 days. A 30-minute timer turns that into one countdown: a brisk walk, a bike ride or a workout video.
For lunch, US federal law doesn’t require a meal break, but a bona fide meal period of 30 minutes or more can be unpaid when you are fully relieved of duty; several states, California among them, require one. Start the timer when you sit down and the ping tells you when to pack up.
Study sessions
Half an hour suits a study block. Work until the alarm, then take a short break with the 5 minute timer.