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