Whichever happens first. You are right about the 85 hours, but you have a couple of months of training, sick, cancelled trips, and used to be several months of reserve. You guys will probably have very short reserve if any.

The difficult part of being on the new fleet at the start is all of the training that has to be accomodated. Even though you are "senior," the junior pilots have to be able to fly a green line after IOE, so when you only have a few jets, even the line holders sit some reserve to accomodate the green pilots training.