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