Yeah, I hear you Rikky1 - is it the babesia protocol that is 30-60 days (repeat if necessary). I'm still working on being sure I've cleared that after almost 6 months.
With this comment on isatis it's in the material medica section and I think it's a general comment on isatis's effect rather than anything specific to the protocol. I certainly noticed that if I was at risk for coming down with anything while I was on isatis it was gone before I could so much as sneeze a second time. I'm definitely keeping this one in the tincture pantry for future use.
I do find there's a disconnect between his section on the herb and his use in the protocol. I like to go over everything in his books very very carefully because sometimes things like this can be tucked in odd corners.
Bulls eye rash August 2013
Started treating with Buhner herbs July 2017
Treating Borellia, Babesia and Bartonella as of November 2017