I have only gotten AF three times in the year since I stopped the protocol. the first one when I stopped the bcps, and the other two times were because I had a couple of days where I didn't keep up my pumping schedule. This caused me to ovulate, I could tell right away. And sure enough, two weeks later, there was AF there to great me. The last time this happened was sometime in the summer, I think.
My friend Shannon has three "homegrown" children, and with breastfeeding all three, she still saw AF normally. So it really does vary from person to person.