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