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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.
Today, we think a year is about 365 and 1/4 days. We ignore the extra 1/4 and save it up for an extra day every 4 years, which we know as February 29 on leap years. Finally, it is important to realize that time units like day and year are related to reality, something occurring in nature.