This is an interesting question. I finished a cycle about 3 or 4 weeks ago, and Used hcg to bring my test back to normal.
Well then I started primo at a low dose 200mg per week, and my nuts shrunk immediately. I was on the primo during my cycle and post hcg for about 4 weeks, last injection was Wednesday of this week.
Anyway I have not lost any gains, but I have obviously noticed a decrease in strength (not much) since I am not on 800mg of test per week. And my nuts are still shrunk, I am assuming they will go back to normal in a couple of weeks?