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