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The time duration from 4pm to 9pm is exactly 5 hours, which equals 300 minutes or 18000 seconds.
4pm to 9pm spans 5 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 4pm (16:00) and 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.