My course was about 4-5 months long (it was about 8 years ago now) and it worked a treat, just remember to carry some vaseline for your lips and some e45 for your face to battle the dry skin!!
I used Roaccutane for a spell when I was in my teens as I had really serious acne. I thought I would be scarred for life basically but as the years have rolled on my face has just got better with age. ...