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.
A regular year has 365 days and a leap year has 366. 366 days in a leap year. I takes the earth 365 and 1/4 days to rotate around the sun. So we add one day every four years to make up for the extra six hours it takes to rotate around the sun each year. Each year normally has 365 days, so we add one for leap years and there are 366 days.