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The time duration from 3am to 7pm is exactly 16 hours, which equals 960 minutes or 57600 seconds.
3am to 7pm spans 16 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 3am (03:00) and 7pm (19:00), but you can adjust the date or add seconds for more specific calculations.