20 Minute Timer
The first block long enough to disappear into — silent reading, homework, focused work.
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Sustained silent reading
Independent reading blocks — sustained silent reading, drop everything and read, whatever a school calls it — commonly run fifteen to twenty minutes, and twenty is where the practice actually pays off. Reading has a warm-up cost: the first few minutes are settling, finding the page, remembering the plot. A block that ends at fifteen minutes spends a third of itself on that. Twenty minutes leaves a real stretch of reading on the other side.
A countdown removes the single most disruptive thing in a silent reading block, which is students asking how much longer. One clock, visible from every seat, and the question stops being asked.
Homework blocks and focus intervals
The ten-minute rule for homework — roughly ten minutes per grade level per night, endorsed by the National PTA and the National Education Association — puts a second grader at about twenty minutes. Setting a timer for that instead of arguing about it changes the conversation at home: the agreement becomes about time, which is checkable, rather than about effort, which is not.
Twenty minutes is also the most common adaptation of the Pomodoro technique for students who find the standard twenty-five-minute interval too long to hold. The trade is real — a shorter interval is easier to start and harder to get deep in. There is no twenty-five-minute page here, so if you want the classic interval exactly, set it on the classroom timer builder.
Embed this timer
A twenty-minute countdown works better small and embedded than full screen and projected. When the timer is the biggest thing on the wall, students read the clock instead of the book. Paste the generated code into the corner of a lesson page at the smallest size so it is available to glance at rather than impossible to ignore.
Frequently asked questions
Is twenty minutes a Pomodoro?
Not the classic one. The Pomodoro technique specifies twenty-five minutes of work followed by a five-minute break. Twenty minutes is a common adaptation for younger students or for anyone rebuilding a focus habit, and the five-minute break stays the same.
How do I stop students watching the timer instead of reading?
Make it smaller and put it off-centre. Embedding the timer at the small size in the corner of a page, or projecting it to one side rather than in the middle of the board, keeps it available without making it the focal point of the room.
Does this work on a Chromebook?
Yes. The timer runs in the browser with nothing to install, so it works the same on a Chromebook, an iPad, a school desktop or a phone. Any device that can open a web page can run it and cast it to a display.