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