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