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