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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.
List of Leap Years. One year has the length of 365 days, 5 hours, 48 minutes and 45 seconds. This is hard to calculate with, so a normal year has been given 365 days and a leap year 366 days. In leap years, February 29th is added as leap day, which doesn't exist in a normal year. A leap year is every 4 years, but not every 100 years, then again every 400 years.