[ido]

Commute there, commute back, shower, eat, say hello to spouse, go to sleep might just take 2 hours, but i wouldn't describe that fit as "easily" (maybe if you live at work).

Remember we're not talking about the exceptional 16h day once in a blue moon but the normal modus operandi over months or years.

Also, 8 hours per night is how much most people like to sleep (and i suspect for good biological reason, long term).