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