We spoke briefly this evening. I asked her to really take the next seven weeks to consider what it is she will be giving up. I asked her not to rush into anything she will regret and I made it clear that if we separate I plan on trying to move on.
Although I'm a big believer of INTERNAL deadlines ("I will give this 6 months, while I do thus-and-such to work on myself, etc, and if things don't improve then I will do thus-and-such"), I do NOT advocate communicating whatever your deadline is to your wayward spouse.
I think you will find that your wife will take this as pretty much your "free pass" to do whatever she wants for the next 6.5 weeks, at which point she will promise you the moon and the stars in order to not do anything harsh.