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The time duration from 3am to 12pm (noon) is exactly 9 hours, which equals 540 minutes or 32400 seconds.
3am to 12pm (noon) spans 9 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 3am (03:00) and 12pm (12:00), but you can adjust the date or add seconds for more specific calculations.