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The time duration from 5am to 9pm is exactly 16 hours, which equals 960 minutes or 57600 seconds.
5am to 9pm spans 16 hours. This period is during the early morning hours when many people are beginning to wake up or start their day.
The calculator above automatically sets the times to 5am (05:00) and 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.