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