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
| 10AM to 1PM | 2PM to 8AM | 1AM to 9PM |
| 7AM to 6PM | 8PM to 6AM | 11AM to 5PM |
| 9PM to 7PM | 9AM to 2AM | 11AM to 9AM |
| 5PM to 9AM | 10PM to 4AM | 2PM to 1PM |
| 4AM to 11AM | 1PM to 9AM | 3PM to 11PM |
| 7PM to 5AM | 3PM to 9PM | 11AM to 6AM |
