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The time duration from 10am to 7pm is exactly 9 hours, which equals 540 minutes or 32400 seconds.
10am to 7pm spans 9 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 7pm (19:00), but you can adjust the date or add seconds for more specific calculations.