Amazon’s Prime shipping is becoming even faster. A company spokesman said Amazon is working on turning its Prime two-day shipping guarantee into a one-day shipping offering. Prime two-day shipping is good for the delivery of more than 100 million items sold on Amazon within two days from the day the item is shipped for almost all the continental US. The goal is to eventually offer delivery for the same number of items to the same locations in one day from the time of shipment. The initiative will take time to come to fruition.. The company said it will take on $800 million in additional expenses in the upcoming quarter.