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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.
Report Abuse. You would have to start by saying there are 7 days in a week. Therefore, you would divide 90 by 7. Your answer would be 12 weeks and 6 days. 7 goes into 90 twelve times, and you have a remainder of 6. lunardream81 Â· 1 decade ago.