Most of the WalMart stores here in Tampa are 24/7, but one near the ghetto is 6-11. That store is the worst... You might find clothes in the freezer case, frozen foods in the hardware and books in the clothing area.
Same with the Charleston SC WMs. A few few months ago, a couple of former 24 hr stores went to night closings. Once the clouds clear and the panic is over, watch how many locations go back to 24 hrs. Probably less than before.