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