YMMV wildly. Walmart of all places generally has a good ratio of self checkout to actual cashiers, but there's this annoying trend with a lot of the local stores where they have only 4 self checkouts period but will only ever have one, maybe two other checkout lanes operating. Doesn't matter if there's a line stretching the full length of one of the grocery aisles, 2 non-self checkout lanes and that's it.