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Assuming a 90 year spell includes 22 leap years, the number of days is equal to (68 x 365) + (22 x 366) = 24820 + 8052 = 32872 days. If the 90 year spell includes 23 leap years, the number of days is equal to (67 x 365) + (23 x 366) = 24455 + 8418 = 32873 days. 3 people found this useful.
Since each year is 365 days (except in Leap years) and there are 10years in a decade , there are 10x 365 day + 2 or 3 leap days,depending on which 10 years you choose. So... 3 â¦ 652 or 3653 days in a decade.