I think it might be better generalized as “don’t code for some daily period of extended downtime”, or even more generalized as “take one very long break between

I think it might be better generalized as “don’t code for some daily period of extended downtime”, or even more generalized as “take one very long break between work days”. Even that won’t necessarily apply to everyone, but for most people it’s a more healthy habit than cranking for >10 hours a day or similar overwork.