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