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The time duration from 12pm (noon) to 7pm is exactly 7 hours, which equals 420 minutes or 25200 seconds.
12pm (noon) to 7pm spans 7 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 7pm (19:00), but you can adjust the date or add seconds for more specific calculations.