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The time duration from 7am to 10pm is exactly 15 hours, which equals 900 minutes or 54000 seconds.
7am to 10pm spans 15 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 10pm (22:00), but you can adjust the date or add seconds for more specific calculations.