It depends. Typically full season leagues that bowl from September through April usually bowl 32-36 weeks.
Short leagues typically bowl 16 weeks, starting around Labor Day ending around the holidays or January through April.
There are a lot of Spring and Summer leagues that typically bowl 10 weeks.
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There are no rules pertaining to the number of games a league bowls each session / week. By default, three games are bowled. Some youth leagues will only offer two or one games for very young bowlers.