All of them on leap years. But on non-leap years, every month but February has 29 days.
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All months have at least 29 days, as February has 29 days during a leap year.
11 months have 29 days..........Only feb has 29 days in the leap year otherwise it has 28 days.
The only month that has 28 or 29 days is February.
A month can be an interval of 28, 29, 30, or 31 days. (Look at a calendar.) 640 days = 20.6452 months of 31 days. (rounded) 21.3333 months of 30 days. (rounded) 22.0690 months of 29 days. (rounded) 22.8571 months of 28 days. (rounded)
That depends on how many days there are in that month. Months with 28 days have 40320. Months with 29 days have 41760. Months with 30 days have 43200. Months with 31 days have 44640.