I saw my neuro yesteray regarding the IVIG I had last month.
He said everyone is different, and the treatment could last weeks or months depending upon the individual.
He said once I start feeling cruddy again, I should let him know, hell schedule me again, and thats how the both of us will know what my schedule will be like.
I had a 5 day treatment, first one. Now Im going to get I believe he said 2 or 3 days, in my home, shorter treatments as maintenance.

Hope you feel better.