Ask three professionals how often to take a screen break and you will get three numbers. An optometrist says every 20 minutes. A physiotherapist says every half hour to an hour. A productivity coach says every 25 minutes, with a longer rest after four rounds. None of them is wrong. They are answering different questions.

The short answer

Three layers, three clocks

Every 20 minutes: a 20-second look into the distance, with a few full blinks, for your eyes. Every 30 to 60 minutes: stand up and change posture for a minute or two, for your body. Every 90 minutes to two hours: a proper break of five to fifteen minutes away from the desk, for your attention.

The layers nest. An hourly stand is also an eye break, and the long break covers everything. In practice you take one short pause most of the time and a longer one a few times a day.

Breaks for your eyes: short and frequent

Near focus is work for the small muscles inside and around the eye, and concentration quietly changes how you blink. The American Optometric Association’s advice is the 20-20-20 rule: every 20 minutes, look about 20 feet away for 20 seconds. The American Academy of Ophthalmology does not name a number; it says to look up from the screen occasionally and focus on something distant, and to make a conscious effort to blink.

How solid is this? A two-week study published in 2023 gave symptomatic computer users software reminders to follow the rule and saw eye-strain and dry-eye symptoms fall, though the gains faded a week after the reminders stopped. A separate lab study the same year found that 20-second breaks during a single demanding 40-minute task made no difference. We unpack both in Does the 20-20-20 rule actually work? The fair summary is that a sustained rhythm of short breaks helps over days and weeks, that the exact numbers are a mnemonic, and that the habit survives only with a reminder.

Twenty seconds is short enough that it does not break concentration if it arrives at a sentence boundary rather than in the middle of one. That timing detail turns out to matter more than the interval.

Breaks for your body: a change of posture each hour

Your neck, shoulders, and lower back do not care where you are looking. They care how long you have held one position. The UK’s Health and Safety Executive, whose display screen equipment guidance underpins office practice across Britain, advises short, frequent breaks over fewer long ones, and says that a change of activity counts. Employer guidance built on it commonly suggests five to ten minutes away from the screen after about an hour of continuous work.

The researchers who found no benefit from 20-second breaks in a single session made the same point from a different direction: longer breaks, and standing up and moving, were what they suggested studying next. A minute on your feet every hour is a reasonable floor. Walk to refill a glass, look out of a window while you are up, and you have taken an eye break at the same time.

Breaks for your attention: longer and rarer

Sustained attention degrades over long stretches, and a real break, one in which you stop thinking about the task, restores it better than a pause spent checking messages. Popular systems formalise this: the Pomodoro technique uses 25 minutes of work, a 5-minute break, and a longer break after four rounds. The specific numbers are convention rather than evidence, but the structure is sound. Somewhere between 90 minutes and two hours, leave the desk for at least five minutes and do something that is not a screen.

If you want one rhythm rather than three, Pomodoro-style 25-minute blocks with the eye break folded into each pause work well, and the longer rest every two hours covers the body too. The point is not to obey a timer. It is that the breaks happen without you having to decide each time.

A schedule that fits real work

Here is how the layers look across a typical morning. Times are illustrative; let them slide to the nearest natural pause.

  • 9:00 Start. The reminder runs quietly.
  • 9:20, 9:40 Twenty seconds looking down the room, four slow blinks, back to work.
  • 10:00 Stand. Refill water, look out of the window, roll the shoulders. Two minutes.
  • 10:20, 10:40 Short eye breaks again.
  • 11:00 A proper break: ten minutes away from the desk, no screen.
  • 11:20 onward Repeat.

That adds up to roughly ten minutes of pauses an hour, most of it in tiny pieces you barely notice. Our guide to building a screen break routine covers how to adapt it to meetings and deep-focus sessions.

Making it stick

  • Let something else keep time. The two-week study’s most useful finding was that the benefit vanished when the reminders did. Willpower is a poor scheduler.
  • Insist on good timing. A reminder that interrupts a call or a sentence gets dismissed and, eventually, uninstalled. EyeRest Flow waits until you stop typing and stays quiet during calls, recordings, and presentations, which is the difference between a rhythm you keep and one you fight. The Chrome extension does the same inside the browser.
  • Make the short break real. Distance, blinks, and a breath. Not your phone.
  • Attach the hourly stand to something you already do. Water, kettle, a window. Habits borrow from existing habits.
  • Accept imperfection. Missing a break is not failure; skipping all of them because one landed badly is the only real failure mode.

Sources

This article provides general information and is not medical advice.