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The time duration from 7am to 8pm is exactly 13 hours, which equals 780 minutes or 46800 seconds.
7am to 8pm spans 13 hours. This period is during the early morning hours when many people are beginning to wake up or start their day.
The calculator above automatically sets the times to 7am (07:00) and 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.