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