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The time duration from 9am to 5pm is exactly 8 hours, which equals 480 minutes or 28800 seconds.
9am to 5pm 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 9am (09:00) and 5pm (17:00), but you can adjust the date or add seconds for more specific calculations.