Hello all ~ I'm thinking about buying 4, 5 or 6 day park hoppers. We're going in March. I'm wondering if I slowly buy them now, if they'll be expired by the time we get there. I've heard different stories. Some say they have a 2 year expiration on them and others say 14 days. Is that 14 days from the first use or 14 days from purchase? Thanks guys, I know I can count on you!!