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The time duration from 12am (midnight) to 11pm is exactly 23 hours, which equals 1380 minutes or 82800 seconds.
12am (midnight) to 11pm spans 23 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 11pm (23:00), but you can adjust the date or add seconds for more specific calculations.