I agree with the previous poster. Asking this is just like asking "how much muscle can I gain in a month". Although these questions are asked in a honest sense... you can't honestly answer them.
Everyone is different - some products respond great for some, and so absolutely nothing for others. I don't want to say that you should go on a spree of trial and errors of pro-hormones, but it just is very hard to say.
Research research research! This site is the best for logs, so find one where the user matches your training/diet for a *potential* match. Never guarantees in the supplement business though.