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estimation of 4 weeks each month
21 weeks
there are 4 weeks
There are never more than 31 days in a month - no month has 5 weeks. There are 52 weeks in a year which is 4 weeks more than four per month, so for computational purposes, you might say that every fourth month has five weeks.
4, because the minimum days in a month is 28, which is equivilant to 4 weeks.