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The time duration from 8am to 8pm is exactly 12 hours, which equals 720 minutes or 43200 seconds.
8am to 8pm spans 12 hours. This period is during the morning hours when most people are active and starting their workday.
The calculator above automatically sets the times to 8am (08:00) and 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.