There are 365*64 days plus 16 leap days = 23,376 days. However, if those 64 years span a century that is not divisible by 400 (e.g. 1900, 2100 or 2200), there would be one fewer days.
There are no leap days in centuries that are not divisible by 400. The year 2000 was a leap year, but 1800 and 1900 were not, and 2100 and 2200 will not be leap years.
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A period of 64 years will contain 16 leap years. There are 24 hours in a day, 365 days in a regular year, and 366 days in a leap year. Therefore, 64 years contains (24 x 365 x (64 - 16)) + (24 x 366 x 16) = 561024 hours.
1,947
64
64
2 years and 316 days.