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The time duration from 9am to 12am (midnight) is exactly 15 hours, which equals 900 minutes or 54000 seconds.
9am to 12am (midnight) spans 15 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 9am (09:00) and 12am (00:00), 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.
