I get IVIG every 3 weeks and it takes about 5 hours. I heard someone in a nearby chair getting Vyvgart and asked the nurse about that option. She said the Pharmaceutical rep told her it targets one area for CIDP whereas IVIG is more broad spectrum. This is all "hearsay", but thought I'd share so you can do some more research. I'm going to stick with IVIG for now as I know that helps and don't want to rock the boat. I don't think they know about causes for CIDP to be sure what would help more.