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