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The time duration from 3am to 10pm is exactly 19 hours, which equals 1140 minutes or 68400 seconds.
3am to 10pm spans 19 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 10pm (22:00), but you can adjust the date or add seconds for more specific calculations.