Do yourself a favor and IMMEDIATELY file a claim with GM, I did and they'll provide you with a case number and verify paying for a rental car if the dealer doesn't offer a loaner!
Today makes 30 days of waiting for our new motor with no ETA! Monday I will notify GM that the AZ Lemon law applies to our vehicle because it has been sitting at the Dealer for 30 days since the repair was authorized and will formally request a vehicle buy-back!