maybe a week, but not full days, because i played a lot with what exctly to use, MR proxy, or istance, or to use many small proxies, or few big ones....
Problem was, that there is gonna be 34 instances if this model. And since this one piece has 200k tris, that would be a lot.
So, it seems the best is to use low poly model of that, and apply proxy to it, and that duplicate instance of this low poly.
Result is, i teste over 2 milion polys, and it renders quite fast, while not using all that much memory.

tnx for comments!