Interesting, it seems like the vast majority so far take the plunge in the first year; I have been planning to go full time at roughly 1.5 years, but I am starting to imagine the changes would be incredibly obvious based on my breast growth so far...
I however don't do things like change my plans quickly, I think all of this information so far has helped me get a bit more insight into how others are doing it, all of the doctors I have talked too tell me HRT takes about 2 years to work 90% of what it is going to change, and if that holds true, then most people are going full time before HRT has done it's full effect.... I have to admit since I started HRT, I really have seen my desire to full time seem to increase at a rate that far outpaces whatever physical changes I am seeing.