31x60x60x109 = = 111600x109 or 111,600,000,000,000 ns in 31 hrs
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Each day has 24 hours, so this simple multiplication is needed to calculate the number of hours in 31 days: 24 * 31 = 774 hours.
31*24 is 744 hours.
31 hours and 40 minutes :)
There are 31 days in December, therefore there are 31 x 24 = 744 hours in the month.
There are: 2 hours and 31 minutes