How Long Should Quality Shoes Last?

I once worked in a shoe store and I would constantly get men and women coming in saying ‘I purchased these shoes x months ago, and they’re already falling apart.’ My inner effortless bitch wanted to say ‘WHAT HAVE YOU BEEN DOING TO YOUR FABULOUS QUALITY SHOES!’ but my customer service voice had to take the shoes, refund them and blow them kisses as they left. Ugh.