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