I am adding but, not contradicting Sara Anne's info. Something past the induction 6 is almost always done. There is a very respected Dr. Herr (now retired from either John Hopkins or Sloan Kettering) some 10 years ago that used just 6. My personal URO (who studied under Dr. Lamm many years ago) had me do 6, 6 weeks off then just another 6. I am adding that he may have simply personalized my situation as while my tumor was high grade it was small, stage TO. His reasoning is every procedure that is invasive (cysto, BCG etc) all carry small but, real potential for problems. The cystos done for a year showed nothing so we never did anymore BCG. My gut feeling is something after 6 is good and Sara Anne's protocol is proven to be good. IF, sensitivity were to increase one can always cut back the number of strength which often happens. Be sure your husband listens to his body/bladder and make sure those scopes are followed!