I was able to get a loaner from AutoNation Ford Katy with about 2 weeks notice. However, similar to Durkin, I've been in the loaner for 6 weeks already and guessing it will be at least 8-10 weeks. Ford sucks.
Chevrolet in the Houston area is not any better in my experience. Warranty work takes forever and forget about a loaner.
North side Lexus however is great. Next day appointments even for routine service comes with a free loaner. Decided to stay with a Lexus for this reason. Ford and Chevy service in the Houston area suck.
CTP is hard to get but if you make an appointment your chances are better my friend is a tech at Demontrond in Cleveland but they only have 4-5 loaners.