There are total 8 hours or 480 minutes from 1am to 9am. In words, this duration is equal to eight hours or four hundred eighty minutes.
How many hours from
| 8PM to 9AM | 6PM to 3PM | 7PM to 2PM |
| 9AM to 10PM | 4AM to 11AM | 12AM to 10AM |
| 10PM to 12PM | 12AM to 4PM | 1AM to 5AM |
| 12AM to 9PM | 10PM to 9PM | 12AM to 12PM |
| 10AM to 6PM | 8PM to 1PM | 1PM to 11PM |
| 1AM to 2PM | 11AM to 7PM | 3AM to 1PM |
