It really has to be your decision. It depends on how much patience you have, and if you really think your marriage is worth saving. It is different from person to person. I have been at this for two and a half years. It is a roller coaster, and you will ask yourself this many times.
I can tell you this, if you are not sure, you are not ready. When you are done, you will know it, and you won't have to ask.
Im still standin better than I ever did looking like a true survivor feeling like a little kid Im still standin after all this time and Im picking up the pieces of my life without you on my mind..