I haven't lengthened enough to notice an increase in height yet, but from what I've heard others say, going through with the process of CLL is what fixes height dysphoria. I would imagine for most people one segment is enough, especially after experiencing what it takes to do just that single segment. The fact that someone spends so much time and money, and goes through so much pain for a couple of inches is what fixes height dysphoria. The change in perspective both from going through the process and from the elevated eye level contribute to fixing height dysphoria. At this point I can already say I'm never going to do my tibias. Even if I only manage to gain 5-6cm on femurs I would be okay with this because it would make enough of a difference to change my life.
Also, as Movie says, your height dysphoria needs to be true height dysphoria for it to be fixed by CLL. If you are short and unhappy with your life, getting taller won't help very much. If you are short and generally happy with your life, then getting taller will help you a lot.