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The time duration from 1pm to 3pm is exactly 2 hours, which equals 120 minutes or 7200 seconds.
1pm to 3pm spans 2 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 1pm (13:00) and 3pm (15:00), but you can adjust the date or add seconds for more specific calculations.