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