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The time duration from 12pm (noon) to 4am is exactly 16 hours, which equals 960 minutes or 57600 seconds.
12pm (noon) to 4am spans 16 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 4am (04:00), but you can adjust the date or add seconds for more specific calculations.
When the end time is earlier than the start time, the calculator automatically sets the end date to the next day.