Cakes is correct...ask your doctor, for sure. Some are retreating right away. Some are adding ribavirin to the mix and going a full 24 weeks. There is no protocol yet. The problem is that we have no real scientific data. The good thing is that these treatments are so short, the data will not be long in coming. And it depends on why one would relapse. Is it resistance or something else? There will be more data coming out from EASL and DDW (Digestive Disease Week) in May. Sorry I didn't explain more fully in my earlier post.
You need to ask your doctor this question.
There is no wait time. But lets hope you don't have to retreat. I bet you won't!!! Keeping fingers and toes crossed for you.
I don't know the answer to your question, but I am following you. You are one of the first 8 weekers on here aren't you? Best of luck to ya, and we're all hoping you don't need to find out the answer to that question!! I will be getting my 12 week SVR test in June after finishing my 12 week Harvoni treatment on March 3rd.