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