Well if there truly the 1 than u can wait forever but more than likely shes not so 2 months
Well if you have tried all you could to impress her, protect her, show her you funny and mature, and chased her and she still hasn't bit the bate after about 2 months, i would call it a day.
Maybe a couple of months or a couple of years if you both go through some tuff times and still stick together
There is no answere to the question. It depends on how fast th relationship is going, and how comfortable you are with each other.