Kate - I think we need to get the current data set aligned, then we can determine the matching or snapping points. I did a small area and it went pretty quickly, of course the test areas always go quickly. I will connect you with the folks in Montana and maybe they can give you some insight on statewide associated features
It certainly depends on the amount and extent of data you are adjusting as well as on the number of displacment vectors that got created in your parcel fabric. If you think it takes too long please contact technical support. If you created data outside of the spatial extent by mistake, it can also have negative impact on the associated features adjustment.