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