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The time duration from 4pm to 8pm is exactly 4 hours, which equals 240 minutes or 14400 seconds.
4pm to 8pm spans 4 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 4pm (16:00) and 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.
