Someone please correct me if I'm wrong, but I believe longer than 6 months if you want ORD (base size maxed out bc we can't get more gates), less than six months if you take DEN (most of upgrades coming from there, creating movement), less than six months if you take MCO (base still growing). All subject to change of course, and I believe we will open a new base in 2017 which will greatly shake things up (your guess is as good as anyone's on where the new base will be)!