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