There are total 8 hours or 480 minutes from 1pm to 9pm. In words, this duration is equal to eight hours or four hundred eighty minutes.
How many hours from
| 5PM to 4PM | 12AM to 3AM | 6PM to 2PM |
| 1AM to 5PM | 8AM to 1PM | 5PM to 5AM |
| 2AM to 1PM | 11AM to 5AM | 10PM to 8PM |
| 6PM to 8PM | 11AM to 10AM | 7AM to 9AM |
| 7PM to 1AM | 6PM to 1PM | 1PM to 11PM |
| 10AM to 1AM | 2AM to 9PM | 10AM to 8AM |
