There are total 15 hours or 900 minutes from 1pm to 4am. In words, this duration is equal to fifteen hours or nine hundred minutes.
How many hours from
| 4AM to 12AM | 10PM to 1PM | 4AM to 4PM |
| 10AM to 11PM | 10AM to 6PM | 11AM to 10PM |
| 12AM to 9PM | 3AM to 1AM | 11PM to 9PM |
| 1AM to 8PM | 10AM to 5PM | 8PM to 7PM |
| 10PM to 5AM | 7AM to 3AM | 8PM to 6PM |
| 6PM to 6AM | 7AM to 12AM | 5PM to 11PM |
