Sort of, but but really. You’re right that historically the daylight hours set an upper limit on the amount of work that can be done per week for most types of work, but that limit is far higher than 8 hours per day over 5 days. The 40 hour work week is based on unions fighting for a 40 hour work week. If it wasn’t for the unions you’d be working all day every day except Sunday, for religious reasons.
That might change over the next few decades too, the current fight is for a 4 day work week and studies are showing promising results there.
Plenty of words mean the opposite of themselves, so much so that there’s multiple words for it; autoantonym, contranym, or Janus words.
This morning my alarm went off so I turned it off.
I wanted to buy a new console as soon as it was out but they were all out.
Two people were left so I left.
I fought with Bob over chores, but I fought with Bob in the war.