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