Online e-commerce behemoth Amazon (AMZN) has kicked off its most anticipated and longest-ever Prime Day event. The event has expanded from 48 to 96 hours this year, running from July 8 to 11. Adobe predicts the four-day shopping spree will equal the combined online spending of two Black Fridays. U.S. online sales are expected to soar to a record $23.8 billion during Amazon’s four-day Prime Day sales event, according to Adobe. The surge in spending marks a 28.4% year-over-year increase, as consumers hunt for ...