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The time duration from 3pm to 9pm is exactly 6 hours, which equals 360 minutes or 21600 seconds.
3pm to 9pm spans 6 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 3pm (15:00) and 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.
