on 695 days 4 supercars becomes available on the used car showroom, i went back in there to buy them after about 25 days had passed and they were gone, to they come back...
To answer your question, yes the cars will come back after another 693 or so days (a full cycle of the used car lot).
And for future information, this forum is just for questions/comments on the actual website. Please direct future posts to the GT4 forum. Note that there will be a delay between the time you post and when the thread actually shows up if it passes the thread moderation.
