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The time duration from 7pm to 9pm is exactly 2 hours, which equals 120 minutes or 7200 seconds.
7pm to 9pm spans 2 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 7pm (19:00) and 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.