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