I am going through the procedure in 3 steps. That's because I was taking prednisolone at the time of the colectomy. It was very hard to deal with when the surgeon told me it had to be three operations, because I had only reckoned with two. He said six months between colectomy and the surgery when he forms the jpouch, giving enough time to get all the pred and its effects out of my system. As it turns out, I'll be livign with the ostomy more than six months, because in the meantime I have started a new job and need to get to a certain point and have a certain amount of work accomplished before I take time off for sick leave.
I'll probably have the 2nd operation mid-December and the takedown one month later.
But this is the important thing: the trend, at least where I am in Europe, is to do the whole procedure in three steps, even when there's no pred therapy in the picture, for the simple reason that doctors and surgeons are seeing much more successful results from the three-step procedure.
So I would personally advise that two steps is better than one. Everything needs some time to heal, and I think it's definitely worth taking more time and going through more surgery (I know - it's physically traumatizing and interrupts your life, is emotionally a big deal) because the results are better, the jpouch functions better and you have higher chances of getting closer to normalcy.