There are total 1 hours or 60 minutes from 9pm to 10pm. In words, this duration is equal to one hours or sixty minutes.
How many hours from
| 3PM to 7AM | 7PM to 4AM | 10PM to 6PM |
| 12AM to 7AM | 4AM to 8AM | 6PM to 4PM |
| 7PM to 10PM | 2AM to 9PM | 6PM to 4PM |
| 10PM to 12PM | 7AM to 1PM | 7PM to 1PM |
| 1PM to 12PM | 11PM to 4PM | 3AM to 12AM |
| 5AM to 11PM | 9PM to 12PM | 1AM to 6PM |
