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The time duration from 4pm to 7am is exactly 15 hours, which equals 900 minutes or 54000 seconds.
4pm to 7am spans 15 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 4pm (16:00) and 7am (07:00), but you can adjust the date or add seconds for more specific calculations.
When the end time is earlier than the start time, the calculator automatically sets the end date to the next day.