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
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.
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, which is how payroll systems record them. Blocks per hour and per day count whole blocks only and ignore the break between them, so a working day fits fewer in practice. | |
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.
20 minutes in other units
- 20 minutes is 1,200 seconds.
- On a timesheet, it is recorded as 0.33 decimal hours.
- It is 33.33% of an hour, or 1/3 of one.
- 3 of them fit into one hour.
- An eight hour working day holds 24, before any break between blocks.
- Against the classic twenty-five minute Pomodoro, it is 0.8 blocks.
Converting a different length is what the minutes to decimal hours converter is for, and adding several together is what the hours calculator does.
Timers either side of 20 minutes
If 20 minutes is the wrong length, the two nearest are 15 minutes and 25 minutes.
Quick focus sprints, stand-ups, and the Pomodoro long break.
The Pomodoro work block, study sessions and single-task focus.
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.
What is twenty minutes in decimal hours?
0.33 hours, rounded from one third.
How many twenty minute blocks fit in an hour?
Three.