There are total 15 hours or 900 minutes from 1am to 4pm. In words, this duration is equal to fifteen hours or nine hundred minutes.
How many hours from
| 12AM to 3AM | 11PM to 10PM | 3AM to 6PM |
| 2AM to 11PM | 9PM to 12AM | 4PM to 10AM |
| 8AM to 10PM | 4AM to 5AM | 10AM to 8AM |
| 12PM to 2AM | 4PM to 1AM | 1PM to 2AM |
| 1AM to 2AM | 1AM to 10PM | 9PM to 8PM |
| 10PM to 7AM | 6AM to 3PM | 6AM to 1AM |
