Chocobo's, over the course of a long spiritbonding session (5 sets or more) can lengthen the time required to complete by 20 minutes or more. especially if you are in a party, that is a pretty big amount.

That said, when I spiritbond, I put it into party finder with "NO CHOCOS" in the comments, just to be sure. I also do not join other spiritbond parties for that reason.