There are 24 hours in a day, so to find out how many days there are in 644 hours, we divide 644 by 24. 644/24=26.83...
.83333..... is equal to 5/6, so to find out how many hours are remaining, we do 5/6*24=20.
So there are 26 days and 20 hours in 644 hours.
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