There are total 20 hours or 1200 minutes from 1pm to 9am. In words, this duration is equal to twenty hours or one thousand two hundred minutes.
How many hours from
| 8AM to 7PM | 11PM to 11AM | 8PM to 9AM |
| 10AM to 4PM | 9PM to 11PM | 6PM to 3AM |
| 1PM to 12PM | 10PM to 8AM | 12PM to 7AM |
| 12PM to 4PM | 12PM to 8AM | 1PM to 4AM |
| 8PM to 9PM | 2PM to 1PM | 1AM to 8AM |
| 7PM to 8PM | 5PM to 10PM | 3PM to 11PM |
