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The time duration from 12am (midnight) to 3pm is exactly 15 hours, which equals 900 minutes or 54000 seconds.
12am (midnight) to 3pm spans 15 hours. These early morning hours are often a quiet time when most people are asleep.
The calculator above automatically sets the times to 12am (00:00) and 3pm (15:00), but you can adjust the date or add seconds for more specific calculations.