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