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