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The time duration from 12am (midnight) to 6pm is exactly 18 hours, which equals 1080 minutes or 64800 seconds.
12am (midnight) to 6pm spans 18 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 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.