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