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The time duration from 7pm to 10pm is exactly 3 hours, which equals 180 minutes or 10800 seconds.
7pm to 10pm 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 7pm (19:00) and 10pm (22:00), but you can adjust the date or add seconds for more specific calculations.