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The time duration from 10am to 4pm is exactly 6 hours, which equals 360 minutes or 21600 seconds.
10am to 4pm spans 6 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 4pm (16:00), but you can adjust the date or add seconds for more specific calculations.