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