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