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