Depends where you are what's on offer. I teach "Digital Photography Beginners" and "Intermediate" but its non-accredited so not determined by external criteria. My view is 10 weeks ought to be enough to get you going, with a bit of homework in between sessions. you can do 'accredited' courses, but the 'qualification' is just a piece of paper. The camera is a tool, get to know what it does and what you can do with it.