Hello tototo,
For any of the DAA medications the cure rate looks like this:
Below 4 weeks there is virtually no cure rate. This relates to the 1/2 life of the replicon being around 4 weeks so you need to "keep killing" it for at least this long otherwise it will recover.
Then on the far right you see the reality. Every extra week of treatment adds a little more to the cure rate, but each extra week adds less than the previous one.
We know that for any patient who is cured we were giving them drugs for at least one day, maybe one week, maybe one month too long but we have to strike a balance between cure rate and duration and our tests are not sensitive enough to detect cure.
For Harvoni the cure rate @ 8 weeks is ~90% and 12 weeks is 95% - that's from the VA data not the Gilead company data. Most of our retreatment cases got only 8 weeks Harvoni.
Maviret is good and the 8 week treatment should give you a ~95% chance of cure. Longer would be nice but you probably just have to chance it at this stage as at day 24 you're almost 1/2 way through. The odds are 20:1 in your favour.