Thank you for the explanation. But isn't the phrasing in the meme totally soul-crushing?

You get 40 hours this year - all year - where you don't have to work for us.

(uttered by some company suit)

seems to be the implication.
In Europe, even part-time workers' time off is counted in "days off." Even if the end result were the same, I just think it sounds a lot nicer for the employee. "Hey boss, I won't be coming in for the next two weeks. Nah, make that three."