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