It actually took me two years, but only because I wasn't that serious about it.
I would have some random moments when I would try WILD and then give up after an hour (since I made a point of trying not to swallow etc - you should not try to avoid swallowing during WILD anyway, you should just stop thinking about it and let it happen naturally), and I was also really bad at recording my dreams.
But then I moved to a new house in some time in October 2011, and then all of a sudden I started getting lucid dreams after just two weeks - and I would get them at least once a week from there for several months.
I guess one reason for this was because I had a new environment to practice in, which I immediately learned to associate with lucid dreaming since I had lucid dreaming on my mind right after moving in there.
It was a very ideal place to lucid dream as well, since it was an inviting cabin in a peaceful neighbourhood with lots of trees all around etc.