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