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
| 1AM to 3AM | 9PM to 11PM | 11PM to 7PM |
| 4AM to 1AM | 10PM to 1PM | 12PM to 8AM |
| 6PM to 2PM | 6PM to 11AM | 8AM to 7AM |
| 4AM to 2AM | 5AM to 12AM | 12AM to 1PM |
| 12PM to 1PM | 3AM to 5PM | 5AM to 11PM |
| 5PM to 4PM | 10AM to 7AM | 8PM to 9AM |
