Earlier quoted context omitted.
> For one thing, it's highly convenient that the standard US work-week happens to be the exact "correct" amount of hours to work to maximize productivity. It's not in the slightest bit down to convenience. It's because 40 hours was quite simply discovered to be a more productive length of day, well over a century ago, back in the later stages of the industrial revolution. In the US, if memory serves, the move to a 40…
It's because 40 hours was quite simply discovered to be a more productive length of day That was true when most of the workforce was doing manual and factory style labour. To the best of my knowledge it hasn't been rigorously reproduced for works that spend their days staring at a screen thinking.
I'm also wondering how commute time (and method of commute) factors into this. Does 30 minutes of physically strenuous cycling before/after work have a positive or negative impact on office workers? Does the same time spent in a car navigating stop'n'go traffic have a different effect? Both involve some element of mental effort, but both are quite different from the rest of the days tasks. Certainly in my experience one helped my mental state and one didn't.