Originally Posted by
progapanda
Will answer my own question for posterity, in case it helps anyone else. The MCT at CDG for 2E to 2F is 60 minutes, and as a result of my schedule change quoted below I was able to change my FB award to a different flight for no additional cost even when my new award itinerary now had a substantially higher cost in FB miles than my original. I'm amazed someone picked up right away and pleasantly surprised at the general competence of the person who assisted me.
Since the new schedule went beneath MCT, it's on AF to change and make right. Should incur no cost to the pax even if they have to put you in a high fare bucket.