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