45 Minute Timer
Not a task — a period. The whole thing, on screen, from bell to bell.
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Timing a whole period
In most secondary schools a period runs forty-five to fifty minutes, which makes this the timer you set once at the start of a lesson and leave alone. What it changes is who owns the pacing. When only the teacher knows how much of the period is left, every decision about whether to keep going is a teacher decision; when the countdown is on the wall, students self-regulate against it, and the last ten minutes stop being a surprise.
It is the right length for an exam that fills a period, for a supervised revision session, and for a lesson deliberately run as one long uninterrupted block rather than chunked. In that last case the countdown is the only structure in the room, which is exactly why it should be visible.
Deep work, planning periods and a half of soccer
Forty-five minutes is long enough to reach the state that shorter blocks only approach. A planning period, a writing session, a marking block — the pattern is the same: one decision at the start about what the block is for, then no more decisions until zero. A visible countdown is what makes the no-more-decisions part hold.
The number has one other well-known home: a half of association football is forty-five minutes plus stoppage time. If you are timing a training match or a small-sided game, this is the half. For fixtures and kick-off times rather than a running clock, the football hub tracks real matches with a countdown to each one.
Embed this timer
A forty-five-minute timer usually belongs on the projector rather than inside a page, since it is timing the room rather than a task. If you do embed it — on an exam instructions page, say — generate the code at the moment the exam starts, and use the large size so it is legible from a distance.
Frequently asked questions
Can students see how much of the period is left?
That is the main reason to use this length. Open it full screen on the classroom display at the start of the period and the remaining time is public for the whole lesson, which is what stops the last ten minutes from arriving unannounced.
Is a forty-five-minute timer suitable for an exam?
Yes, with one caveat: it counts down from when you start it, not from a fixed clock time. Start it at the moment you tell students to begin. If you need the timer to end at an exact time on the clock, use the custom date and time option on the classroom timer builder instead.
Can I use it to time a half of soccer?
For a training match, yes — a half is forty-five minutes of regulation play, and this timer runs it. It does not handle stoppage time, which is added at the referee's discretion, so treat zero as the end of regulation rather than the whistle.