I am finally 14 months into my transition and I'm about done. Like the previous poster, the front half of my hair grows SO SLOW but the back has been done transitioning for a few months. I have 2-3 inches of relaxed ends left around the front.
Like you, I had no plans to BC because the relaxed hair blended just fine (except the front but I covered it up with headbands). I took great care of my hair and it grew so fast. I did mini trims myself every few months to get rid of the ends though I wouldn't recommend that, I just haven't found a stylist who isn't scissor happy.