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