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
| 6PM to 1PM | 8PM to 12AM | 2AM to 12PM |
| 4AM to 10AM | 7AM to 2AM | 4PM to 1AM |
| 1AM to 3PM | 11PM to 10PM | 8PM to 3PM |
| 7PM to 3AM | 7PM to 9PM | 11AM to 12PM |
| 10AM to 3PM | 2AM to 5AM | 4PM to 3PM |
| 9PM to 6PM | 12AM to 1PM | 10PM to 11AM |
