Exactly. I really like the empirical example. I find that solutions to work problems come to me at most random circumstances, shower, sleep, etc. Also a 15 minute break can unblock something that I’ stuck on for hours.

I think it’s important to realise that there’s that limit to productivity, so don’t force it if it’s not working. take a break, come back tomorrow, you may find that you’re far more productive even though you’re spending less time “bums on seats”. Somewhat employer dependent