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The time duration from 6pm to 9pm is exactly 3 hours, which equals 180 minutes or 10800 seconds.
6pm to 9pm spans 3 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 6pm (18:00) and 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.