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The time duration from 1am to 12pm (noon) is exactly 11 hours, which equals 660 minutes or 39600 seconds.
1am to 12pm (noon) spans 11 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 1am (01:00) and 12pm (12:00), but you can adjust the date or add seconds for more specific calculations.