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