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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.
8760 plus 6 = 8766 days in 24 years. However, if the 24 year period spans a century mark that is NOT divisible by 400, then there are only 5 leap years in that 24 year period, so there will be only. . . 8760 plus 5 = 8765 days in that 24 year period.