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