There are total 21 hours or 1260 minutes from 4pm to 1pm. In words, this duration is equal to twenty-one hours or one thousand two hundred sixty minutes.
How many hours from
| 8AM to 2AM | 9PM to 8PM | 10AM to 5PM |
| 9AM to 1AM | 6AM to 3AM | 11PM to 9AM |
| 7AM to 3AM | 9PM to 6AM | 8PM to 10PM |
| 12PM to 6AM | 12AM to 4AM | 12PM to 5PM |
| 1AM to 8AM | 2AM to 9PM | 9PM to 1PM |
| 3AM to 11PM | 8PM to 10PM | 9AM to 10AM |
