I see T ones every other week. Due to scheduling issues, it is now down to ones every three weeks for our last session and the next session. I am considering keeping it at one's every three weeks because I am getting lower on stuff to discuss with her. Besides, it might help me save some sessions for future use (I'm allowed 30 sessions per year). I doubt that I will have a problem keeping it below that.
As for internalization, I have never heard of that. But, it seems to be a description of when I "obsess" about my T. I fantasized about her following me at work and pointing out when I did something good. It was a strange sensation to feel at work. I now just think about her words more than any thing else. I can see her in my mind and sometimes imagine her there.
AS for needing her, I still need her. I am studying to become an addiction counselor and I just can't imagine someone needing me like I need my T at times. I just need her positive thinking at times. She helps me to get out of the black and white thinking mode and into the gray zone.