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Re:Ask HN: How do you manage to work less than 8 hours despi... by p2detar on Sunday May 09, 2021 @06:48AM (#27094924)
I know what you mean. Funny enough, I settled on 45 mins., because this was/is how long a single class lasts at schools in my home country.

I just put to use a habit built long time ago.

Re:Ask HN: How do you manage to work less than 8 hours despi... by atatatat on Sunday May 09, 2021 @04:06PM (#27099252)
They do that because human focus on a single task wanes after ~50-60 min.