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 12PM | 6PM to 3PM | 6AM to 7AM |
| 12AM to 4AM | 1PM to 11PM | 3AM to 2PM |
| 10PM to 3AM | 3AM to 2PM | 12PM to 7AM |
| 6AM to 9PM | 11PM to 8PM | 6AM to 6PM |
| 2PM to 12PM | 8PM to 11PM | 2AM to 9PM |
| 10AM to 6AM | 8AM to 9AM | 8AM to 6PM |
