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The time duration from 4am to 3pm is exactly 11 hours, which equals 660 minutes or 39600 seconds.
4am to 3pm spans 11 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 4am (04:00) and 3pm (15:00), but you can adjust the date or add seconds for more specific calculations.