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
| 6PM to 1PM | 11AM to 7PM | 12PM to 3PM |
| 9PM to 8PM | 1AM to 4AM | 7PM to 6PM |
| 9AM to 2AM | 11AM to 1PM | 11PM to 10AM |
| 10AM to 10PM | 1PM to 5PM | 8PM to 11AM |
| 5AM to 3PM | 12AM to 4PM | 4PM to 3AM |
| 1AM to 11AM | 4AM to 12AM | 7AM to 5PM |
