From one of our students...
In my case, I started the course in November 2013 and completed in July 2014, passing all 14 exams on the first try over three sittings whilst being a 49 year old father of two and working full time."
It's doable - but it's motivation that counts. Neil Sedaka once said that there were plenty of other better singers than him, but he had the motivation. So true.
Phil