How to calculate time duration manually

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To calculate the difference between two times (not necessarily times-of-day) enter times into the two fields below in the format: hours:minute:seconds; orEnd time. 2. 6/9/2007 10:35 AM. 6/9/2007 3:30 PM. 3. Formula. Description (Result). 4. =B2-A2. Hours between two times (4). You must manually apply the To figure out when he finished doing his homework, add the hours together then add the minutes together.