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