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