There are total 9 hours or 540 minutes from 4am to 1pm. In words, this duration is equal to nine hours or five hundred forty minutes.
How many hours from
| 1AM to 11PM | 5AM to 12AM | 9PM to 6PM |
| 1PM to 8AM | 2AM to 4AM | 2PM to 11AM |
| 10AM to 2PM | 7PM to 8AM | 11PM to 5AM |
| 12AM to 5PM | 1AM to 4PM | 9PM to 2AM |
| 6AM to 5AM | 5PM to 9AM | 9AM to 8PM |
| 7PM to 4AM | 5PM to 2AM | 1AM to 11AM |
