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The time duration from 5pm to 9pm is exactly 4 hours, which equals 240 minutes or 14400 seconds.
5pm to 9pm spans 4 hours. This period is during the evening hours when many people are finishing their workday and heading home.
The calculator above automatically sets the times to 5pm (17:00) and 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.