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