Many people working a job with regular hours want to find out the duration of their work day. If you're also wondering "how many hours am I working?" and you are on a 9AM to 5PM job, then the question is how many hours is 9 to 5. The answer is exactly eight hours.
If you leave your kids early at school and pick them up in the afternoon, you might wonder how much time they spend in school each day. If you leave them at 7AM and pick them up at 3PM then the question is how many hours is 7AM to 3PM and the answer is eight hours (15-7 = 8).
Here are some more examples of calculating how many hours are between two specified points in time. You can use our hours calculator above to compute the time between any two times specified by hours and minutes.