A's caught in the early, 'heady' times are harder to bust I think, and withdrawal is longer as they are still remembering the highs - no real lows to drag those memories down.
I'm sure this is true for some, but this has not been my experience in observing affairs. Longer-term, deep emotional attachments -- even those that have long since passed the early lust/infatuation stage -- are harder to bust than those caught in the beginning.
I'm generalizing (and I had said, "on average"), but I would say that those caught early are easier to bust, and have shorter withdrawal periods. Those busted later, MAY OR MAY NOT be hard to bust, depending on how things are going in paradise between the affair couple, but the withdrawal period is going to be longer.
I'm really happy to hear your entire family has been so supportive -- that is truly a blessing!