tooloora

45 Minute Timer — lesson, study block, half of a match

Forty-five minutes, preset. The length of a school lesson, a serious study block and one half of a football match.

Runs locally — nothing is uploaded

45:00

Remaining

Minutes and seconds may go above 59: 90 in the minute field means one and a half hours.

Quick pick

Runs locally in your browser — nothing is sent.

Other durations

1 minute3 minutes5 minutes10 minutes15 minutes20 minutes30 minutes1 hourPomodoro

Forty-five minutes is the teaching unit: press start and the preset timer runs 2,700 seconds, then signals with sound and a visible alert. It matches a school lesson, a study block long enough to get somewhere, one half of a football match or a laundry cycle that finishes while you keep working.

Why is a lesson exactly 45 minutes?

The number has two independent anchors that keep reinforcing each other. In football it is written down: Law 7 of the IFAB Laws of the Game defines a match as two halves of 45 minutes. In German schools the 45 minute lesson grew out of the nineteenth century timetable, where the full hour left no room for changing rooms — the quarter hour became the break, and the remaining three quarters became the lesson.

Is 45 minutes a good study block?

It is the longer of the two common blocks. Twenty-five minutes suits tasks you have to trick yourself into starting; forty-five suits material you have to hold in your head, because a longer stretch loses less time to getting back in. The important part is the break afterwards — a block without a break is just a longer block.

Can I use it as a match clock?

For an informal match, yes: run 45 minutes, take the break, then run the second half. For stoppages, pause and resume — the measured time is preserved exactly, so a two minute treatment break does not silently disappear into the half. If you would rather record how long something took, the stopwatch mode with laps is the right tool.

How to set the timer

  1. Press start — forty-five minutes are already set.
  2. Teach, study or play; the tab title keeps the remaining time in view.
  3. At the end you get a tone and a visible alert; pause and resume works at any point.

Frequently asked questions

How do I add the break after the lesson?

Reset after the signal and set the break length in the minute field, for example 15 minutes, then start again. The quick-pick chips above the fields cover the common break lengths with one tap.

Does the countdown keep the exact time if I pause repeatedly?

Yes. Each running span is measured against its own start timestamp and added to the total, so any number of pauses produces the same result as one uninterrupted run of the same net length.

Does the timer keep running when I switch tabs?

Yes. The remaining time is calculated from the timestamp at which you pressed start, not by counting ticks. Browsers slow background timers down to about one call per minute, and a sleeping device stops them completely — a counting timer would fall behind by exactly that amount. This one simply subtracts again when the tab comes back and shows the correct value.

Does the timer send anything to a server?

No. No server is involved at all: the countdown is a subtraction against your device clock, done entirely in JavaScript in your browser. There is no account, no cookie for the timer, and nothing is uploaded or sent anywhere. You can load the page, switch to airplane mode and the timer still runs — which is the simplest way to verify the claim yourself.