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