There are total 1 hours or 60 minutes from 1am to 2am. In words, this duration is equal to one hours or sixty minutes.
How many hours from
| 4AM to 9PM | 2PM to 1PM | 8PM to 12AM |
| 10AM to 9PM | 10PM to 7AM | 4AM to 8AM |
| 7PM to 8PM | 2AM to 4AM | 2AM to 3PM |
| 3PM to 8AM | 4PM to 9AM | 11AM to 11PM |
| 1PM to 2AM | 7PM to 11PM | 1AM to 12PM |
| 6PM to 12AM | 10AM to 5AM | 6AM to 2AM |
