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The time duration from 8am to 3pm is exactly 7 hours, which equals 420 minutes or 25200 seconds.
8am to 3pm spans 7 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 3pm (15:00), but you can adjust the date or add seconds for more specific calculations.