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