I've had somewhat of a messed up work out history. I'm 28 now. I worked out through most of high school, mostly when not doing sports and I really did not work legs correctly. This off and on carried through to about 21. Around 21 I got serious, although wrong, about training and put on decent gains, I could bench about 285 and weighed about 180. Again no leg work. About age 23 I met my wife and stopped lifting from then till about age 26. I then got back into it for about six months and hit legs hard, this is when I hit 275 on Squat, I also stopped again.
We have been back in the gym now for about six months and this is my first max since our return. So I can't really tell you how long it took, I can say I have been working lower body very hard the past six months and I am seeing the best gains of my life. I am also not going to failure and doing full body workouts 3 times a week.
That is probably not much help for a timeline but it is a truthful as I can be.
My next goal?? That is a tough one. I'd have to say it is to continue to grow. I don't really have a stregnth goal, I guess it would be to bench 315 and squat 405 for now..
I'm currently weighting about 195, I'd like to drop a bit of fat and get up to around 215-230 eventually.