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