Well, I agree with min when he said that it's however many surgeries that you want done are done, as long as something is done.
For me, I had my top surgery on Tuesday, and consider myself post-op. In addition, I have only been on T for 10 mos., but once all the legal junk goes through, I'll consider my transition officially over, despite the fact that I don't even have a sorry excuse for a beard yet.
I know a lot of people talk about hysterectomy. I really don't care for one, for personal reasons. If something happens and doctors are worried about cancer and insurance will pay for it, then I'll take care of it. Not beforehand. I don't consider hysterectomy a trans surgery for me personally (this is just for me, guys. I know how important it can be to others). Just general upkeep and removal of a useless organ. Kind of like the appendix when people start having trouble with it.
But hey, that's just my take on things.