Just how long should a customer have to wait for service when they're checking out at a store ? It depends on a lot of factors. For example, if you check out at a store at 6 PM and there are no cashiers to be seen for a minute or two, you might be confused and annoyed. At 2 AM at that same store, you'd probably take it in stride if there were no cashiers , knowing you may have to go find that person and tell them you're ready to pay. The same goes for family stores, or small shops where the sto…