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