Each state approves courses for the amount of credit hours they believe are appropriate. The amount of credit hours you will learn depends on the number of hours for which the state in which you are licensed has decided to approve the course. You can easily find this information by selecting the course and looking at the Details tab. This tab will list every state which has approved the course, the number of hours the state has decided to grant the course, and other pertinent information such as in which county the course is approved if your state breaks courses up by counties.
NOTE: Spending more time in a course won't make it count for additional hours.