I just wanted to share some info that my endocrinologist recently gave me. There are numerous articles on HRT reversible and irreversible effects, once HRT is stopped. Most of them state that these reversible effects will occur after 6 to 8 months (depending on the article).
I was on HRT for 4 months, ending on June 30, 2006. I stopped because of certain health reasons, under the advice of my doctor. Everything is okay now, so, under the monitoring with my endocrinologist, I will commence HRT again within 2 weeks.
Anyway, after only 4 months, I developed breasts approaching an A cup. I still have this size today, and have lost nothing after stopping HRT. My endo says that "you don't lose what has developed," as there is a very intricate network ov veins and tissue that do not just "go away."
So for anyone that feels they will just "grow breasts" to see what it's like, and then go back to normal, "Be careful what you wish for."
By the way, my sisters and mother were a B cup (2 were a large . My endo thinks that I will beat the odds and become a C (Yahoo)

. He says that I have developed very quickly but can see that I have much more room for development.