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The time duration from 4pm to 3pm is exactly 23 hours, which equals 1380 minutes or 82800 seconds.
4pm to 3pm spans 23 hours. This period is during the afternoon hours when people are typically active and working.
The calculator above automatically sets the times to 4pm (16:00) and 3pm (15:00), 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.