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