There are total 3 hours or 180 minutes from 1am to 4am. In words, this duration is equal to three hours or one hundred eighty minutes.
How many hours from
| 10PM to 9AM | 9PM to 12PM | 10AM to 8PM |
| 10PM to 5AM | 6PM to 5AM | 3PM to 1PM |
| 8PM to 7PM | 8AM to 5AM | 10AM to 7AM |
| 9AM to 6AM | 8AM to 12AM | 9AM to 3PM |
| 8PM to 8AM | 5AM to 3AM | 12AM to 10PM |
| 11PM to 9AM | 9PM to 11PM | 5PM to 1PM |
