It took me about 8 months of to get through and there were a couple of resits on the way. Most evenings and weekends were taken up with study/hours building depending on the weather.
It is a lot of work but it happened to suit me. I wouldn't say it's ideal for everybody as you are very much on your own and there's always a reason not to study! On the plus side, you can work at your own speed, go over tricky bits as many times as you want and you can always phone/e-mail an instructor if you get stuck.