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