A Federal Government website managed by the U.S. Department of Health and Human Services. healthfinder.gov is sponsored by the National Health Information Center 200 Independence Avenue, S.W., Washington, DC 20201 Page last updated: Thursday, April 20, 2017.
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.
FOR REFERENCE: Every three calendar years will have 365 days. The fourth year is a leap year of 366 days (this makes up for the extra quarter day over four years). 1992, 1996, 2000, and 2004 are leap years.