I think they get about 30 days after the first 13 arrives before they are sent to auction, that's what the Nissan dealership did where I worked, but I guess it depends on the make and model. Something like an Altima, they wanted the old out ASAP so they could make you buy the more expensive new model. Subaru moves a bit slower, down here in the south anyways, might find one on the lot a bit longer.. I started out answering this with a sure answer, now I'm not sure what I know anymore haha
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12 WRX Sedan OBP - RA mudflaps and stock!
12 Impreza Sedan Premium ISM - old lady's ride