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