Fast charging degrades the battery. Obviously you will choose a slower charger if you know you will be gone for 45 minutes.
Walmart is also unlikely to have these charges, since they obviously do not want people to rush through their stores. (Obviously charges after a couple of hours might be there.)
True, but in practical terms this is not worth worrying about for most of us. Saw a recent article where a Korean driver had done over 600,000km (~ 375,000 miles) in his Ioniq 5 on the original battery. He'd only ever used DC fast chargers, typically charging to 100%!
His battery did fail around the 600,000km mark, but most vehicles never get anywhere close to that sort of mileage. And apparently it still retained 87% of original capacity up until that point.
And despite being far out of warrantly, Hyundai replaced his battery as a goodwill (good publicity!) gesture.
Walmart is also unlikely to have these charges, since they obviously do not want people to rush through their stores. (Obviously charges after a couple of hours might be there.)