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