There are total 7 hours or 420 minutes from 9pm to 4am. In words, this duration is equal to seven hours or four hundred twenty minutes.
How many hours from
| 6AM to 8AM | 4AM to 4PM | 9PM to 5PM |
| 1PM to 7PM | 8PM to 10PM | 2PM to 3PM |
| 11AM to 10PM | 8AM to 2PM | 10AM to 6AM |
| 2AM to 8PM | 9AM to 5AM | 3AM to 1PM |
| 1PM to 5AM | 1PM to 8AM | 11AM to 12AM |
| 2PM to 2AM | 12AM to 4PM | 8AM to 5AM |
