A timer for the class period
Forty-five minutes is a common lesson length, and a visual timer helps both teacher and students pace the time. Press Full screen to display only the large digits and the progress ring on a projector or interactive whiteboard; the screen stays awake while the timer runs where the browser supports it. A possible outline:
| Part | Length | Clock shows |
|---|---|---|
| Warm-up | 5 minutes | 45:00 → 40:00 |
| Explanation | 10 minutes | 40:00 → 30:00 |
| Group or individual work | 25 minutes | 30:00 → 05:00 |
| Wrap-up | 5 minutes | 05:00 → 00:00 |
For a single activity within the lesson, a shorter preset such as the 10 minute timer is often more useful.
Football halves and training
An adult football match is played in two halves of 45 minutes. Referees keep the official time and add stoppage time, so this timer is best for training games, five-a-side sessions or following a match at home. Start it at kick-off, press Pause during long stoppages if you want to track playing time, and use +1 min for added time.
Exam practice and study
Many tests and exam sections last around 45 minutes. Practising under timed conditions, with the 45 minute timer running and no peeking at notes, is a good way to learn how to pace yourself. Check the clock at 30:00 and 15:00 to see whether you are a third and two thirds of the way through the questions.
Workouts
A 45-minute session leaves room for a proper warm-up, the main workout and stretching, for example 10 + 30 + 5 = 45 minutes.
How the timer works
Start, Pause and Reset at any time, and +1 min to extend. The alarm can be muted, and phones that support it vibrate. The timer stays exact in background tabs and works offline once loaded. Nearby lengths: the 40 minute timer and the 60 minute timer.