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