Prime Day starts at noon PT (3 p.m. ET) on Monday and runs through Tuesday at 11:59 p.m. PT (Wednesday, 2:59 a.m. ET). Amazon has promised more than a million items will be going on sale Monday and Tuesday.
Prime Day began four years ago and has grown more popular each year. Prime Day 2017 saw the busiest day of online sales in Amazon’s history, even outdoing Black Friday, the day after Thanksgiving.