This question is impossible to answer. It may never appreciate to its original strength, and, really, it's all relative. Relative to the Euro, relative to the USD, relative to how much you can buy with it and how much effort or work does it take to earn it.
I foresee a slow appreciation process, where the government becomes strong and stable, the oil fields are producing, new fields are discovered, the infrastructure returns to what it once was, and the citizens interact harmoniously with each other, respecting each other's faith and ethnicity.
I know that this answer is probably not what you are looking for, and I apologize, but it's the best I can do.
Thank you very much for your great question!