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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.
simple 1st take 70 years divide it by 4 because every 4 years there is one extra day :) so. 70/4=17.5 which is 17 extra days :) 1 year = 365 days. so 365 times 70 years: 365*70 = 25550 days + 17 extra days = 25567 days. now multiply it by 24 for the hours. 25567*24 = 613608 hours.