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