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The time duration from 8am to 10pm is exactly 14 hours, which equals 840 minutes or 50400 seconds.
8am to 10pm spans 14 hours. This period is during the morning hours when most people are active and starting their workday.
The calculator above automatically sets the times to 8am (08:00) and 10pm (22:00), but you can adjust the date or add seconds for more specific calculations.