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