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