I think 90 minutes is a safe estimate, seems to be about what it usually takes us. We fly SW and by choice sit in the back of the plane so are usually among the last off, then we have to have a bathroom break once off the plane. We have been lucky in that the resort we are going to is usually the first stop-Coronado. Since we are usually on the very first flight of the day there isn't too much of a line to get on the bus and have only had to wait a little once on the bus.
Our next trip is our first at the YC, hoping it goes as smoothly. We land at 8:25AM, I booked a brunch for 11:30, so that gives me some cushion.