There are total 21 hours or 1260 minutes from 4am to 1am. In words, this duration is equal to twenty-one hours or one thousand two hundred sixty minutes.
How many hours from
| 11AM to 5AM | 9AM to 8AM | 2PM to 5PM |
| 6PM to 3AM | 6PM to 9PM | 5AM to 4PM |
| 8AM to 10PM | 2PM to 6AM | 10PM to 3PM |
| 7PM to 9AM | 3AM to 5PM | 12AM to 10AM |
| 12AM to 5AM | 10AM to 9PM | 10AM to 3AM |
| 6AM to 7PM | 5PM to 4PM | 10PM to 2PM |
