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