I split the type of tasks into (1) Reading, and (2) Coding.
For every 25 minutes of active reading, I take 5 minutes of eye break, and drink a glass of water, get up and stretch.
For every 45 minutes of coding, I take 15 minutes of break which includes a drink of water, followed by a small walk.
In both scenarios, every alternate break, I would just take a 10 minute break to calm down and breathe.
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