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