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The time duration from 12pm (noon) to 9pm is exactly 9 hours, which equals 540 minutes or 32400 seconds.
12pm (noon) to 9pm spans 9 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 9pm (21:00), but you can adjust the date or add seconds for more specific calculations.