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