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