if time was fungible, then working 40 hours instead of 60 hours would only make it take 50% longer in calendar-time to get the thing done. And if you have some

if time was fungible, then working 40 hours instead of 60 hours would only make it take 50% longer in calendar-time to get the thing done. And if you have some other income stream, then that extra time might not matter much. And if getting enough sleep and seeing your family makes you mentally healthier the calendar-time penalty might be less than 50%. Maybe a lot less.