I'll answer like this. When the thought of ending the marriage is more appealing to you then remaining in limbo then you've hit your limbo limit.
Thanks TX.....I think a lot of it has to do with the self-confidence of the LBS. Also, do you agree that at some point in time the LBS has to take some sort of action whether it be separation or D before the WW wakes up? I know it's a dice roll but it appears that just going along for the ride no matter what you do is a recipe for success. Especially if there are no signs from the WW wife that they are still engaged in making the R work.