There are total 20 hours or 1200 minutes from 8am to 4am. In words, this duration is equal to twenty hours or one thousand two hundred minutes.
How many hours from
| 9AM to 10AM | 12PM to 3PM | 9PM to 9AM |
| 12PM to 7PM | 3PM to 4AM | 11AM to 7PM |
| 2PM to 1AM | 8PM to 8AM | 4AM to 1PM |
| 9AM to 12PM | 5AM to 6PM | 5AM to 2PM |
| 10PM to 12PM | 1PM to 9PM | 5PM to 7AM |
| 11AM to 10PM | 5PM to 9AM | 9PM to 8AM |
