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The time duration from 12am (midnight) to 8pm is exactly 20 hours, which equals 1200 minutes or 72000 seconds.
12am (midnight) to 8pm spans 20 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 8pm (20:00), but you can adjust the date or add seconds for more specific calculations.