There are total 21 hours or 1260 minutes from 4am to 1am. In words, this duration is equal to twenty-one hours or one thousand two hundred sixty minutes.
How many hours from
| 11PM to 12PM | 8PM to 6AM | 2AM to 2PM |
| 11AM to 3PM | 7AM to 8AM | 8AM to 11PM |
| 1PM to 8AM | 5PM to 6PM | 12AM to 9PM |
| 6AM to 2AM | 7PM to 12PM | 3PM to 6PM |
| 10PM to 1PM | 6AM to 11PM | 4PM to 4AM |
| 8AM to 9AM | 6PM to 11AM | 6PM to 5AM |
