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