The printing method used is called Print on Demand (POD). That means when your order goes in to the website, it is automatically sent to the print factory to be printed individually. This process takes about 5-7 days. Then depending on where you live in the world, you should expect a couple of weeks after that, before your product(s) arrive. You will receive notification emails during the process.
It could well be three to four weeks before your order arrives.