There are total 15 hours or 900 minutes from 9pm to 12pm. In words, this duration is equal to fifteen hours or nine hundred minutes.
How many hours from
| 7PM to 8AM | 3AM to 6AM | 11PM to 12AM |
| 9PM to 5AM | 1AM to 11PM | 6PM to 9PM |
| 10AM to 3PM | 8PM to 1AM | 3PM to 8PM |
| 6PM to 10AM | 10AM to 2PM | 12AM to 2PM |
| 10AM to 10PM | 8AM to 7PM | 4AM to 12AM |
| 12AM to 8AM | 9PM to 8PM | 7PM to 7AM |
