About six months since I've most recently been trying with dedication.. but before that I tried for a few months about a year and a half ago without any success.. I just went through some boxes in my basement to give things to goodwill though, and found a journal from Sept. 2006 when I had my first ever lucid dream, which I think sparked my interest to start intentionally having them.. I read S.LaB's Lucid Dreaming when I was about 14 though and have always been interested but unfortunately didn't put any effort into it/doubted. But now, it's sweet.