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
| 5PM to 4PM | 7PM to 9PM | 8PM to 2PM |
| 10PM to 9AM | 9PM to 3PM | 8AM to 2PM |
| 9AM to 1PM | 4PM to 3PM | 1PM to 2AM |
| 6PM to 2PM | 4AM to 8PM | 11AM to 10AM |
| 7PM to 12AM | 12PM to 7AM | 12PM to 11PM |
| 9PM to 8AM | 8AM to 2AM | 5AM to 4PM |
