I've searched the archives as best I could, but couldn't find a definite answer, so...

How long should I wait before calling to ask why my ECV hasn't been posted to my account? I recently rescheduled an MSY flight because of the hurricane and had a fare difference that the GE rep said would post to my account as a ECV. My itinerary changed immediately (I really do give credit to NWA for their great website), but the ECV is nowhere to be found. Is this normal?