We have always had excellent luck in collecting and using FP during our vacations. We collect them whenever possible and try to use them that day but save them for another day if possible. This is what we did on our last vacation in July as well. We were only rejected on our last day at Space Mountain (where the manager type replaced it with a one time MK ride one day only pass) and at RNR by a foreign worker. We told him it was our last day and no other worker really seems to care and he let us through. The person to take our FP never even looked at it twice. I would never throw a FP away. Even if one worker rejected it earlier in the week, I would have tried again. As I tell my kids, it never hurts to try and as Bawb said, "They can't hit ya!"