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