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The time duration from 10am to 6pm is exactly 8 hours, which equals 480 minutes or 28800 seconds.
10am to 6pm spans 8 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 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.