According to e-commerce data agency ECDB, the average Amazon user in the U.S. places 22 orders a year, which is roughly one order every 17 days. This frequency ranks first among major U.S. retailers. Walmart comes in second with 14.8 orders a year, roughly 15, which is 7 orders less than Amazon. eBay users place less than half as many orders as Amazon users. Target users order 5 times a year, while Best Buy and Costco users order about 3 times a year, meaning roughly once every four months.