I am not sure but I think the Miracle Mile shops are much longer than a mile.
This place is huge!! And they have stores in there that I can afford!! Which really is a big deal, because Vegas has so many high end shops, its easy to feel inadequate when forced with the decision on whether to pay your mortage or purchase a handbag.
Be prepared to spend a half day shopping or walking around. But no worries, when you get famish, there are plenty of restaurants/bars nearby to provide you with a picker-upper to completer your journey in the Miracle Mile Shops.