Respect your rythm for productivity
1 – Work in large time blocks. On one thing at a time.
2 – Don’t sit continuously for longer than 20 minutes in a row. I have fun with 1,000 seconds—aka 16 minutes and 40 sends.
3 – Don’t work continuously for longer than 2 hours. And take a solid, rejuvenating break right after each block.
Source here : https://mindfulambition.net/oscillations/