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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.
This idea suggests that, as the Creation took 6 Days and the Lord rested on the 7th Day, so also there would be 6 Days of 1000 years each for human history, following which the Lord would return and rule mankind for a period of 1000 years, or the Millennium of rest found in Revelation 20.