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
| 9PM to 7AM | 8PM to 2PM | 9AM to 10AM |
| 4AM to 11PM | 11AM to 9PM | 6PM to 5AM |
| 10AM to 4PM | 7PM to 10AM | 9PM to 10AM |
| 9AM to 8AM | 9PM to 10AM | 12PM to 9PM |
| 12PM to 2AM | 6AM to 10AM | 3AM to 11AM |
| 12AM to 2PM | 6AM to 8AM | 2PM to 11PM |
