[abstractbeliefs]

Not sure about the US, but in the UK which seems to be fairly culturally aligned, we're expected to put in an average of 7.5h of "logged in" work, with core hours being 09:30-16:30, and a mandatory 30m unpaid lunchbreak.

(I say average because you're expected to put in ~37.5h of work a week, and have the deficit/surplus at month end of +-5h)

[mattmanser]

Having worked 20 or 30 temp jobs in my time as well as perms, in the UK in the 2000s it used to be 37.5/37/35 hours per week for office and 40 for industrial or warehouse work, but it's increasingly common to see 40 for office.