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