There are total 21 hours or 1260 minutes from 12am to 9pm. In words, this duration is equal to twenty-one hours or one thousand two hundred sixty minutes.
How many hours from
| 8AM to 9AM | 9AM to 9PM | 2AM to 8PM |
| 4AM to 7AM | 9AM to 2AM | 8PM to 3PM |
| 3AM to 8PM | 12PM to 1PM | 12PM to 1AM |
| 6AM to 2PM | 1AM to 4AM | 2PM to 10PM |
| 10PM to 6PM | 4PM to 3AM | 7PM to 9AM |
| 12PM to 9PM | 8PM to 2PM | 12PM to 4AM |
