I can't speak to the Hash House in Reno. But the ones in Vegas close at 10 (Sahara), 1:00am (The Plaza), and 24/7 (The LINQ, formerly The Quad/Imperial Palace). And their prices are actually pretty reasonable considering the portion size.
14 bucks for the Kokomo Meat Loaf Sandwich w/ Cheddar Bacon Mashed Potatoes (or the side of your choice). I think that's a pretty fair deal.
Not to mention their pancakes are larger than frisbees.