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