There are total 11 hours or 660 minutes from 10am to 9pm. In words, this duration is equal to eleven hours or six hundred sixty minutes.
How many hours from
| 8AM to 8PM | 4PM to 5PM | 8AM to 12AM |
| 8AM to 12AM | 7PM to 2PM | 8PM to 11AM |
| 2PM to 6AM | 4AM to 5PM | 3AM to 10AM |
| 2PM to 9AM | 10AM to 7AM | 10PM to 9AM |
| 11AM to 4PM | 7PM to 4AM | 7PM to 12PM |
| 4AM to 4PM | 4AM to 6AM | 11AM to 8AM |
