My gut feeling, from reading your post, is that your T is infatuated with you! She certainly thinks you're interesting, intelligent, and successful, which it sounds like you are. Your theater background is fascinating to your T. It sounds like transference in reverse, which is actually called counter-transference.

No, it's not normal for sessions to last that long on a regular basis, especially to talk about subjects other than your therapy issues. I think your T has a problem and, unless she gets help, it's going to get worse for you.

You can either talk about it with her, find another T, or let things go on as they have been, but I don't recommend the last option. Even if her intentions are innocent, she isn't acting like a T; it sounds like she's acting like someone growing personally interested in her client.