I worked a place that did rotating shifts and we experimented a lot with different scheduling (sometimes out of necessity due to temporary understanding). And it's insane how I could still work an average of 40 hours per 7 days, but depending on the shift or the numbers of days on/off I'd feel much different. I generally felt like shit because rotating shifts killed my social life, but 4 10 hour shifts then 3 days off felt much better than 9-5 work with only weekends off.