A very individual answer. It takes as long as you need to complete the lectures, complete the assessments, the practical components and the exams. If you study full time (approx 15 - 20 hours per week) it should take approximately 4 weeks, if you take it a little more slowly, study part time (8 - 10 hours per week) then it would be approximately 8 weeks. Again though the pace is set by you and the work you put in.