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