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