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