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The time duration from 3am to 8pm is exactly 17 hours, which equals 1020 minutes or 61200 seconds.
3am to 8pm spans 17 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 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.