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The time duration from 5pm to 4pm is exactly 23 hours, which equals 1380 minutes or 82800 seconds.
5pm to 4pm spans 23 hours. This period is during the evening hours when many people are finishing their workday and heading home.
The calculator above automatically sets the times to 5pm (17:00) and 4pm (16:00), 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.