Prime Day, Amazon's biggest shopping event, is here, and now one-day shipping is the norm for tens of millions of items available during Amazon's Prime Day event, which runs from July 15 to July 16. To succeed at this rapid delivery, Amazon spends tens of billions of dollars every year and employs 250,000 workers in its U.S. warehouses. The process is an incredible challenge, and Amazon has faced criticism about working conditions at every step of the process. Watch the video to see what happens when you buy a Prime-eligible item on Amazon.com. » Subscribe to CNBC: https://cnb.cx/SubscribeCNBC » Subscribe to CNBC TV: https://cnb.cx/SubscribeCNBCtelevision » Subscribe to CNBC Classic: https://cnb.cx/SubscribeCNBCclassic About CNBC: From 'Wall Street' to 'Main Street' to award winning original documentaries and Reality TV series, CNBC has you covered. Experience special sneak peeks of your favorite shows, exclusive video and more. Connect with CNBC News Online Get the latest news: https://www.cnbc.com/ Follow CNBC on LinkedIn: https://cnb.cx/LinkedInCNBC Follow CNBC News on Facebook: https://cnb.cx/LikeCNBC Follow CNBC News on Twitter: https://cnb.cx/FollowCNBC Follow CNBC News on Instagram: https://cnb.cx/InstagramCNBC #CNBC How Amazon Delivers On One-Day Shipping