I shop once on the weekend, and usually once mid week for produce and stuff that's become extra popular unexpectedly (like when DP went on a walnut binge and finished off a whole can in two days!).
My mother goes once a week, at most. They are paid bimonthly, and only have funds one of the two checks for shopping for non-essentials, so that cuts down the trips. My grandmother has gone daily my entire life (and most of hers). She got married right out of HS and spent her first two married years in Germany with my grandfather in a tiny USAF base housing unit, with no refrigerator. To her, NOT shopping daily is crazy!