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The time duration from 3pm to 6pm is exactly 3 hours, which equals 180 minutes or 10800 seconds.
3pm to 6pm spans 3 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 3pm (15:00) and 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.