There are total 9 hours or 540 minutes from 9am to 6pm. In words, this duration is equal to nine hours or five hundred forty minutes.
How many hours from
| 10AM to 8PM | 1PM to 9PM | 4PM to 11PM |
| 6PM to 1AM | 12AM to 6PM | 6PM to 1PM |
| 11AM to 6AM | 12PM to 12AM | 10PM to 5AM |
| 6AM to 6PM | 5AM to 4PM | 9PM to 1AM |
| 1PM to 11PM | 6AM to 7AM | 7PM to 5PM |
| 2AM to 8AM | 2AM to 4PM | 4PM to 5AM |
