There are total 12 hours or 720 minutes from 1pm to 1am. In words, this duration is equal to twelve hours or seven hundred twenty minutes.
How many hours from
| 9PM to 8AM | 5PM to 3AM | 6PM to 10PM |
| 2AM to 10PM | 2AM to 1AM | 7AM to 2AM |
| 1AM to 9AM | 10PM to 8PM | 11AM to 2PM |
| 2PM to 9AM | 6PM to 9AM | 10AM to 7AM |
| 3PM to 9AM | 7PM to 1AM | 11AM to 7AM |
| 12AM to 9AM | 6AM to 12AM | 8AM to 11PM |
