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The time duration from 6am to 6pm is exactly 12 hours, which equals 720 minutes or 43200 seconds.
6am to 6pm spans 12 hours. This period is during the early morning hours when many people are beginning to wake up or start their day.
The calculator above automatically sets the times to 6am (06:00) and 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.