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The time duration from 10am to 8pm is exactly 10 hours, which equals 600 minutes or 36000 seconds.
10am to 8pm spans 10 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 10am (10:00) and 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.