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