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The time duration from 8am to 7pm is exactly 11 hours, which equals 660 minutes or 39600 seconds.
8am to 7pm spans 11 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 7pm (19:00), but you can adjust the date or add seconds for more specific calculations.