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