45 Minute Timer
Forty-five minutes is a common lesson length and a solid block for deep work.
Ready
Good for
Class period
Many schools run 45-minute lessons; keep the countdown visible for the class.
Mock exam section
Practise answering under the same time pressure as the real exam.
Deep work block
Long enough to get into flow on hard problems.
💡 Showing it to a class? The Classroom Timer uses much larger digits; set a custom 45 minutes there.
Popular timer lengths
Frequently asked questions
Will the timer still be correct after 45 minutes?
Yes. It measures against your device clock, so it does not drift over long periods.
Can I use dark mode on a projector?
Yes. Use the theme button in the header; dark mode is easier on the eyes in a dim room.