 The data stretches all the way back to 2019. Prime Day 2024 is here. It may be branded as Prime Day, but the sales run for 48 hours. And if you're looking for an air fryer, a new set of headphones or a TV, you can get some pretty steep discounts and not just on Amazon. Other large retailers, including Walmart, Best Buy and Target, are dropping some big deals of their own as they try to cash in on the summer sale.