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