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