Nope, when I've needed warranty repairs for my DTS (and the DHS and Eldo before it), the dealer just hands me a rental car for however long it takes. Of course, it's in their best interests to speed the repairs as quickly as possible to lower that rental cost, but then again they get reimbursed for it by Cadillac. If your dealer is telling you one day only for a multi-day repair, you need to 1) find a new dealer and 2) lodge a complaint with Cadillac about this dealer's poor customer service. Good luck.
Craig
Craig