I was first diagnosed in 2005 with a single low grade tumor. My Doctor removed that and just had follow-up Cystoscopy's. 18 months later a few more tumors popped up so I underwent BCG treatments. I did 3 month, then 6 month, and finally yearly Cystoscopy's and was all clear until November of 2022. Another couple of tumors, CIS this time, and a round of BCG. Follow-up Cysto found a couple more spots so currently doing a second round of BCG.
After 10 year clean, I asked my Doctor why continue with the yearly scopes. He said, "it's cancer, why wouldn't you?" Glad I listened to him.
Good luck and keep vigilant.......