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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.
Aug 31, 2011 One day almost everyone wonders how many weeks there are in a year. The answer seems to be obvious because it is elementary mathematics. You can count them by dividing 365 days per year by seven days per week. This way weâll get 52 weeks plus one day. If it is one of the leap years 1 with 366 days, it has 52 weeks plus two extra days.