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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.
365 days are in a normal year. 366 days are in a leap year which comes every four years. In 2007, there are 365 days while in 2008, there are 366 days in the year. Source(s): Math Textbook, just learned today.