I voted 6 years, but it is presumably as soon as Mr. Wistrcill leaves for greener pastures. That seems to be the pattern. AD leaves to a bigger school before having time to actually get stuff done, claiming credit for things that happened through his predecessor, and the new guy wants to bring in his own head coach from his own circle of friends. Rinse, repeat. The key here is the AD. If Wistrcill stays long enough to be able to take credit for his work, then hiring Ianello could be counted among his successes. If he leaves, Ianello gets fired for not living up to the new standards of the new AD, even though those standards are the same as we've always had but since he's not from the new AD's list of contacts he doesn't get the extra latitude.