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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.
There are 3,652 or 3,653 days in a decade. There are 365 days in a year unless it is a leap year in which there are 366 days. There are also 10 years in a decade. Given this information there would be 3,650 plus either 2 or 3 years that would include the extra leap year day. The answer would be 3,652 or 3,653.