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The time duration from 9pm to 4am is exactly 7 hours, which equals 420 minutes or 25200 seconds.
9pm to 4am spans 7 hours. This period is during the evening or night hours when many people are winding down their day or engaging in leisure activities.
The calculator above automatically sets the times to 9pm (21:00) 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.
