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