14 Months so far, but I spend about 15-20 hours a week in the gym at least it's about all I do. If you think I am talking out my ass I did have 5 different trainers at LA Fitness and they all showed me exercises incorrectly, at the time I did not know but then I found these guys
http://ngbb.net/Pages/Home/home.htm several people here have world records in the past and can move over 1000 pounds on some lifts.
Quick fact, with only working out for 14 months I can deadlift 425, squat 315, and bench 265 so I must be doing something right.
I am not trying to bash trainers but it's just a fact, once you get past the "new gym" part you see all the trainers run the same things on a 20 year old man or a 60 year old woman and it's from some bullshit they ripped out of men's health.