There are total 13 hours or 780 minutes from 8am to 9pm. In words, this duration is equal to thirteen hours or seven hundred eighty minutes.
How many hours from
| 9AM to 1AM | 10PM to 7AM | 8PM to 3AM |
| 9AM to 7AM | 3PM to 8AM | 7AM to 4PM |
| 2PM to 1AM | 10PM to 12AM | 12AM to 8AM |
| 9PM to 11PM | 12AM to 6AM | 4PM to 1AM |
| 6PM to 6AM | 12AM to 12PM | 5PM to 8PM |
| 1PM to 4AM | 7PM to 12PM | 1PM to 11PM |
