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