It's all in how one looks at it -- perspective. I had a friend long-term colon survivor who said, "If you didn't drop dead the moment you heard you had cancer, you are a survivor." I subscribe to that theory.
However, Lucie did not feel like a survivor until she got to an extended period of feeling good. That happened last August, when she was in rehab from pneumonia. She was about 10 months from diagnosis at that point. So, it differs with different people. I don't think you can get a unanimous agreement on a definition. So, pick one as yours. Don