20 Minute Timer
A 20 minute timer counts down 1,200 seconds and sounds an alarm when it reaches zero. That is 0.33 decimal hours on a timesheet, or 33.33% of an hour.
A twenty minute timer is the upper limit of a power nap and the interval in the 20-20-20 rule for eye strain.
Paused at 20:00
What a 20 minute timer is used for
Power naps, eye breaks, and exercise blocks.
- A power nap
- Twenty minutes is the longest nap that reliably avoids deep sleep, so you wake without the grogginess of sleep inertia.
- The 20-20-20 rule
- Every twenty minutes, look at something twenty feet away for twenty seconds, which is the standard optometric advice for screen work.
- The anime break
- Twenty minutes is roughly one episode, which is the break length the Animedoro method is built around.
- Exercise blocks
- Twenty minutes of continuous moderate activity is the common daily minimum in public health guidance.
Taking a twenty minute nap that works
Set the timer for the whole twenty minutes, including the time it takes to drift off, rather than starting it once you feel sleepy. That keeps the nap short enough to stay out of deep sleep. Early to mid afternoon is the usual window, when alertness naturally dips, and naps late in the day can make it harder to sleep at night.
Some people drink a coffee just before lying down, on the basis that caffeine takes roughly twenty minutes to kick in and will arrive as they wake. If you are at a screen rather than napping, the same length drives the 20-20-20 rule: every twenty minutes, look at something about twenty feet away for twenty seconds.
The 20 minute timer at a glance
| Attribute | Value |
|---|---|
| Length | 20 minutes |
| Seconds | 1,200 |
| Decimal hours | 0.33rounded |
| Clock format | 0:20 |
| Share of an hour | 33.33% |
| Fraction of an hour | 1/3 |
| Blocks per hour | 3 |
| Blocks per 8 hour day | 24 |
| Pomodoros (25 min each) | 0.8 |
| Break that pairs with it | 5 minutes |
| Decimal hours are rounded to two places, as payroll does. Block counts are whole blocks with no breaks between them. | |
For other lengths, use the minutes to decimal hours converter or the hours calculator.
Your focus time, counted and kept
A countdown tells you when the block ends. PomoTodo records that the block happened, which task it went to and what the week added up to, so a month of 20 minute blocks becomes something you can actually look at.
Free plan tracks unlimited focus time across unlimited tasks. No card required.
Timers either side of 20 minutes
If 20 minutes is the wrong length, the two nearest are 15 minutes and 25 minutes.
For the method rather than the countdown, see the Animedoro timer with a 20 minute break.
Questions about the 20 minute timer
Why is twenty minutes the limit for a power nap?
Past roughly twenty minutes you begin dropping into slow wave sleep, and waking out of it causes sleep inertia, the heavy grogginess that can last half an hour. Staying under twenty keeps the nap in lighter stages, so you get the alertness without the cost.
Does the 20-20-20 rule actually help?
It is standard advice from eye care organizations for digital eye strain. Looking into the distance lets the eye's focusing muscles relax, and the pause is a reminder to blink, which people do less while looking at a screen. The exact numbers are a memorable rule of thumb rather than a precise prescription.
Is twenty minutes of exercise a day enough?
It adds up to 140 minutes a week, just under the World Health Organization's recommended minimum of 150 minutes of moderate activity for adults. A couple of longer sessions at the weekend, or making some of the twenty minutes vigorous, takes you over the line.