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The time duration from 3am to 11pm is exactly 20 hours, which equals 1200 minutes or 72000 seconds.
3am to 11pm spans 20 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 3am (03:00) and 11pm (23:00), but you can adjust the date or add seconds for more specific calculations.