This. A lot of people seem to confuse what "average" means.
Yeah. Mean, median, mode, and "typical" are not the same.
IIRC, back when 5E came out, WotC said that the typical long running campaign met once a week or every other week from August to May before ending or being abandoned: in other words, the school year. Hence their Adventure books being placed so as to fit in thst school year time frame.
This makes a lot of sense considering the college crowd. The group is only in physical proximity over the school year.