I did about 7cm. It got very hard around 6cm for me. My bone consolidation was fine for my right leg, but for some reason, much slower for my right leg (I'm actually still consolidating now, if you can believe that, on my left leg). My left leg still continues to make improvements.
I was able to reach down and touch the floor with the palms of my hands before getting LL, and for the past year, I've been able to do it post LL as well. My flexibility was above average before LL, but I worked at it.
The only real complaints I have from the surgery are the recurring pain I get in my right leg and (due to having longer femurs) it being harder to do certain exercises (such as squats) properly. I can still squat, but can barely hit parallel, and that's with a much wider stance. It's annoying, but whatever...I wanted to be taller, and I got it.