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The time duration from 1am to 4pm is exactly 15 hours, which equals 900 minutes or 54000 seconds.
1am to 4pm spans 15 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 1am (01:00) and 4pm (16:00), but you can adjust the date or add seconds for more specific calculations.