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