For the most part, people are patient, but some experiences create frustration for virtually everyone. A customer transaction company Omnico Group found that most people are willing to wait just up to eight minutes in a checkout line before abandoning their cart. Time standing in line leads to reconsidering the purchase. If you think about holiday shopping or even a Saturday morning grocery line, you can imagine how many lonely carts there are and how many dollars are lost from items not purchased. According to Parcel Pending, that number is $38 billion.