Hi Scott

The standard reports don't have the actual time that the user was logged in and accessing the course. This is hard to measure as someone logged into the course may not be actively working on the course. There are some third party plugins that some Partners have used to try an measure the actual time - some partners can comment on what plugin have been used and how successful this has been.

There are fields in the course completion report that show the total time to complete a course and when the user started the course - these show the total elapsed time rather than the actual time taken active in the course which I assume is what you are after.

regards