calculate duration between hours and units
If we recall that the unit of time is âthe Day,â this value represents 1-1/3 days of time. Since there are 24 hours in a day, converting to hours is a simple multiplication 24 * 1.3333 = or 32 hours. (24 * 4/3 to be more precise). Finding the number of hours between two date/times is simple, just subtract the start date/time from the end date/time and multiply the result by 24 hours.