One order can give you more than one customer's grocery list order. If there are two people, you're probably going to have to use two shopping carts. If you have three customers in that order, it could be three shopping carts. It took me 2 hours to complete 1 $20 order. If a customer wants 8 bananas weighing over 2.75 pounds, you have to find the right one. An item not there? You have to wait for the customer to respond. There will probably be something not in stock. I hope Instacart fails.