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The time duration from 4am to 6pm is exactly 14 hours, which equals 840 minutes or 50400 seconds.
4am to 6pm spans 14 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 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.