I am curious here, how long does the WAS stay with the OW or OM? I know it's different for different people, but and idea would be nice.
I know exactly where you are in asking this. My W has been with OM for almost six months now (living with him for four months), so I've caught myself thinking: "It's getting to the six-month mark. Shouldn't they be over by now?" Then again, timelines are tricky, and so are human beings. Unfortunately, you'll just have to let time do its thing in the end and see what happens.
I have studied many A's and have noticed that most of them seem to die out pretty quickly on the grand scheme of things once the shine comes off. This may mean months, but usually not years. It also helps to detach, I think. Once they're getting nothing but OP, they might realize that they're only getting 20% and leaving the 80% behind.