20 Minute Timer

What is the 20-20-20 rule?

For long periods of screen use, the American Academy of Ophthalmology suggests that every 20 minutes you look at something at least 20 feet (about 6 metres) away for at least 20 seconds (AAO: Computers, Digital Devices and Eye Strain). A twenty-minute countdown is a simple reminder: when it rings, look out of the window, then press Reset and Start for the next round.

Is twenty minutes a good length for focused work?

For many people, yes. It is shorter than a full Pomodoro, which helps on days when concentration is low, yet long enough to write a section, solve a set of problems or read a chapter. Try it for a few sessions and adjust up or down depending on when your attention starts to wander.

How can teachers use twenty minutes?

• Main activity: pupils work in pairs on an assignment while the countdown runs on the board.
• Presentation slots: about fifteen minutes to present and five for questions.
• Reading circle: groups read and discuss a text, then report back.
• Test section: one part of a practice test under time pressure.

Add a label on the classroom timer page if you want the activity name shown next to the countdown.