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The time duration from 7am to 4pm is exactly 9 hours, which equals 540 minutes or 32400 seconds.
7am to 4pm spans 9 hours. This period is during the early morning hours when many people are beginning to wake up or start their day.
The calculator above automatically sets the times to 7am (07:00) and 4pm (16:00), but you can adjust the date or add seconds for more specific calculations.