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This note is based on brief research on taking breaks.
(I am currently in danger of becoming homeless. If you can spare a few dollars, it would help a lot. PayPal.me/Guard13007)
(This summary was published on its own as a blog post.)
Take breaks every 20 to 70 minutes. Finding the right frequency for you may take trial and error. Multiple sources agree that something near 50 minutes of work with 10 minutes of break works well. The Pomodoro technique combines more frequent shorter breaks with infrequent longer breaks, and is commonly used. The longer you go between breaks, the longer your breaks should be.
A break is only effective when you do something different from what you're doing now. The primary differences that matter are using different areas of the brain (or not trying to utilize your brain during a break), a difference in eye-focus (stop looking at screens if you were, look far away if you were focused on something right in front of you), and a difference in physical activity (move more if you weren't moving, or stop for a bit if you were).
(Vacations have beneficial effects, but these seem to be limited in scope and duration. I believe this take is missing important nuance.)
The Inc claims every 50-90 minutes, with a break lasting 15-20 minutes. They source an Army research project on "ultradian cycles" and The Atlantic claiming a perfect balance of 52 minutes of work followed by 17 minutes of rest.
Pomodoro claims a cycle of cycles: 5 min breaks every 25 minutes, but after 4 of these cycles, take a 15 minute break.
It can depend on the type of work, but 90 minutes as a total cycle length is a maximum that should not be crossed.
A 20-30 minute break before a test increases scores dramatically.
PCMag claims 12% of work-day should be breaks. They mention The Muse claiming 57-mins work followed by 17-mins break is ideal, but this is not well-supported. They also claim a break every 20 minutes is important.
TODAY is only looking at negative health effects of sitting for too long, but highlight that standing or taking a break from sitting every 30 or 60 minutes (with 30 being better, obviously) reduces or eliminates increased risk of cardiovascular disease.
One of these sources (though I forgot which) included reference to a study showing better decision-making when interruptions were present, theorizing that due to being force to de-focus from a task (thus "taking a break"), the benefits of a break were realized despite not explicitly including one.
It needs to be different from what you were doing.
If you are doing a lot of mental work, doing physical work as a break is effective. (The reverse is true too.)
Psychology Today claims that participating in creation based on a fandom is very beneficial (more beneficial than other breaks?). Don't feel guilty for "wasting time" on fan-creation!
Avoiding stimulation is probably important. (That source feels like it might encourage unhealthy ideas? Be careful citing it.. It has vibes of "everything must be productive" / hustle culture.)
If you are having trouble not thinking about work, distraction is key.
Naps: A nap can be a good use of a break, but it's important to make sure that the timing of the nap works within your sleep cycles. (Sleep cycles start shallow and brief, but get progressively deeper and longer. A nap should only go through 1-2 cycles, taking somewhere between 20-60 minutes. If you wake up feeling bad, you woke up at the wrong part of a cycle, and should adjust your timing to be earlier or later.)
Some sources (like this one) claim that boredom is bad, but I also think of daydreaming as an activity that involves boredom. I think my definition is different and this causes the disconnect. I think of boredom as a useful tool for ideation when I associate it with things like freewriting, creation, and daydreaming - all activities that involve some form of expression. Boredom seems to be defined more as a sapping of mental energies from the way it was referenced in a few things I read today (or as equivalent to being unfocused - which is exactly where boredom as a beneficial force in breaks is useful..). Ultimately, I need to research boredom as a concept.