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