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The time duration from 1pm to 11pm is exactly 10 hours, which equals 600 minutes or 36000 seconds.
1pm to 11pm spans 10 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 11pm (23:00), but you can adjust the date or add seconds for more specific calculations.