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The time duration from 3am to 6pm is exactly 15 hours, which equals 900 minutes or 54000 seconds.
3am to 6pm spans 15 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 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.