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The time duration from 12pm (noon) to 6pm is exactly 6 hours, which equals 360 minutes or 21600 seconds.
12pm (noon) to 6pm spans 6 hours. This period starts at noon and covers part of the daytime when people are typically active and working.
The calculator above automatically sets the times to 12pm (12:00) and 6pm (18:00), but you can adjust the date or add seconds for more specific calculations.