May be center specific not sure. They are letting us opt in at any point. Just notify management. "I would like to be on the 9.5 list". That's it and you're good.
I was told by my two shop stewards and BA that I had to go over 3 days, the only change was that it didn't have to be a bid route. So they either let me get in at a decent time to see my family or pay me extra for my lost family time.