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The time duration from 2am to 8pm is exactly 18 hours, which equals 1080 minutes or 64800 seconds.
2am to 8pm spans 18 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 2am (02:00) and 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.