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