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The time duration from 11am to 3pm is exactly 4 hours, which equals 240 minutes or 14400 seconds.
11am to 3pm 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 11am (11:00) and 3pm (15:00), but you can adjust the date or add seconds for more specific calculations.