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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.
From Jan 1 2000 until Jan 1 2013, 13 years, there are 4749 days. 13 years can also consist of 4748 days (Jan 1 1999 through Jan 1 2012) or 4747 days (Jan 1 2099 through Jan 1 â¦ 2112).