There are total 21 hours or 1260 minutes from 1am to 10pm. In words, this duration is equal to twenty-one hours or one thousand two hundred sixty minutes.
How many hours from
| 9AM to 10PM | 7PM to 6PM | 12AM to 3PM |
| 8AM to 5AM | 8PM to 8AM | 11PM to 9AM |
| 5PM to 1AM | 11AM to 12AM | 10AM to 7PM |
| 4AM to 9PM | 9AM to 10PM | 3PM to 1PM |
| 11AM to 11PM | 6PM to 4PM | 7PM to 2PM |
| 10AM to 7PM | 1PM to 2AM | 1AM to 8PM |
