I had infusion #19 today (after an 8 week break). The slowed down infusion (2 hours instead of 1) is still the way to go for me. I am having relatively few side effects from my infusion which is nice. My eyesight went back to being really crystal clear sharp again!! Strange, huh? It had started to blur up a little over the 8 week break. Anyhow, if I don't get a UTI this time we may go to 6 weeks in between infusions. I'm not sure I want to go back to every 4 weeks for fear of PML and UTI's. It's all still play it by ear.....