I think 8 hours of preset structured time is too much for some professions. 2-4 hours of preset/structured time per day is very reasonable with the rest of the

I think 8 hours of preset structured time is too much for some professions. 2-4 hours of preset/structured time per day is very reasonable with the rest of the time open for flexible creative work as needed, at least in a field that works on intellectual products. I work in a research environment and it's not like creativity just turns on and off with a switch because it's 8am on Monday and someone said I need to be working right now. It also doesn't turn off at 430PM because that's when work ends. You can require me to be there and have me iterate on existing ideas, but you won't see any profound output, just small iterative improvements. My greatest ideas happen in my leisure or during casual yet in-depth conversations. Heck, some of my best output happens when some idea hits me on a slow weekend morning or late in the evening and I delve deep into it. For physical labor, 8 hours a day is pretty doable, I'd say 6-7 is reasonable. I've done both types of work and don't have much problem with 8 hours that don't require me to think very deeply. Typical office work fits in here and involves doing simple broad tasks, often mixing in some random light physical activities and usually has little work baggage that you carry home with you (unlike creative work). If the work is very physically taxing, I feel it has the same effect as very mentally taxing work in that you can sustain it for much less time (say, physically moving heavy objects which requires manual downtime). I recently moved myself and no matter how motivated I was to move those boxes, my body needs a physical recovery break.