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