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The time duration from 1am to 7pm is exactly 18 hours, which equals 1080 minutes or 64800 seconds.
1am to 7pm spans 18 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 7pm (19:00), but you can adjust the date or add seconds for more specific calculations.