I've seen four hours mentioned fairly often, as long as you are taking real breaks. It's possible to occasionally go longer, but only if broken up into smaller

I've seen four hours mentioned fairly often, as long as you are taking real breaks. It's possible to occasionally go longer, but only if broken up into smaller consecutive blocks. I'd say six hours in three two-hour blocks with an hour for lunch in one of the breaks. Be deliberate about disconnecting and walking away from work when done, exercise daily. Get enough sleep. https://maxfrenzel.medium.com/in-praise-of-deep-work-full-disconnectivity-and-deliberate-rest-e9fe5cc50a1d https://maxfrenzel.medium.com/in-praise-of-deep-work-full-di...