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