About 3 months, but a month is not a fixed number of days.
There are an average 4.3 weeks per month. Hence, 4.3 times 3 is 12.9 weeks.
Or taking the average of 30.44 days per month, 91 days is almost exactly 3 months.
Or we see that 13 weeks is also about 1/4 of the year of 52.18 weeks. Also 3 months.
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