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