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The time duration from 6pm to 9am is exactly 15 hours, which equals 900 minutes or 54000 seconds.
6pm to 9am spans 15 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 6pm (18:00) and 9am (09:00), 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.