I'm so sorry about your relapse; this is such a really long difficult road....
I'm a 3A and relapsed after monotherapy in 1994 (I was unable to retreat until my liver showed progression). My specialist does not expect me to respond quickly this time (I'm in my 5th week and waiting the results of my PCR), but expects me to clear by 12 weeks, and, if so, I'm hoping he (and my body) will let me extend treatment.
You didn't mention the state of your liver or whether you'd had a biopsy result? With those details, your question would be a good one to poste to Dr Dietrich, the resident expert here.
http://www.medhelp.org/forums/show/272
There are other G3's on this site who are doing extended therapy the second time around.
Do you get rescue meds made available to you? and what stage is your biopsy result?