There are total 9 hours or 540 minutes from 4pm to 1am. In words, this duration is equal to nine hours or five hundred forty minutes.
How many hours from
| 9PM to 1PM | 1PM to 9PM | 6AM to 2PM |
| 9AM to 11PM | 6PM to 8PM | 7AM to 2PM |
| 4PM to 5PM | 5PM to 1AM | 7AM to 3PM |
| 8PM to 5AM | 5AM to 6PM | 6PM to 4AM |
| 11PM to 4AM | 5AM to 7PM | 7PM to 2PM |
| 11PM to 10PM | 4PM to 10AM | 3PM to 7AM |
