There are total 15 hours or 900 minutes from 1am to 4pm. In words, this duration is equal to fifteen hours or nine hundred minutes.
How many hours from
| 9PM to 1AM | 5PM to 4PM | 9PM to 1PM |
| 2AM to 8PM | 4AM to 8PM | 11AM to 8PM |
| 6PM to 8AM | 3AM to 6AM | 3AM to 6PM |
| 12AM to 8AM | 7AM to 6AM | 9PM to 6AM |
| 3PM to 7AM | 9AM to 4AM | 5AM to 7AM |
| 12AM to 4PM | 5AM to 10AM | 5AM to 3AM |
