My guess is it depends on school, my elementary school does both during the same time, but my junior high has them separate until I moved here to U.S.
40 people clean the classroom isn't that much stretch when you only have 10-15 mins, usually you got around 10 people on windows (both side of class room). 2-3 on black board, 2 on black board erasers, 2-3 on garbage, 5-6 people sweep, 5-6 people mop (inside classroom and corridor), the rest swipe desks/chair, moving objects for others to clean, etc.
There are also school where they leaves cleaning after school, and have 5-10 people per rotation for everything.... well, you got the idea...
Anyway, my favorite part on this episode is when Kyosuke trick Sena into admitting Homo Club is a kami-ge and Kuroneko gave this evil smile in the corner as she ties up the garbage bag. That is by far my favorite detail in the episode.
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