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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.
How many days are in 6 decades? A decade is ten years, a non-leap year year contains 365 days, in ten years either two or three leap years will fall. Therefore in ten years there will be 10 times 365 days pl â¦ us two more for the two leap years which makes 3,652 days in a decade, or three more for th three leap years which makes 3,653 days in a decade.