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The time duration from 8am to 12pm (noon) is exactly 4 hours, which equals 240 minutes or 14400 seconds.
8am to 12pm (noon) spans 4 hours. This period is during the morning hours when most people are active and starting their workday.
The calculator above automatically sets the times to 8am (08:00) and 12pm (12:00), but you can adjust the date or add seconds for more specific calculations.