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The time duration from 8am to 11pm is exactly 15 hours, which equals 900 minutes or 54000 seconds.
8am to 11pm spans 15 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 11pm (23:00), but you can adjust the date or add seconds for more specific calculations.