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The time duration from 7pm to 8pm is exactly 1 hour, which equals 60 minutes or 3600 seconds.
7pm to 8pm spans one hour. 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 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.