For procrastinating holiday shoppers, getting a last-minute gift to arrive on time is as simple as choosing an expedited shipping option on Amazon. But for the delivery personnel tasked with ensuring that delicate Grumpy Cat snow globe is in the hands of its intended recipient in a timely manner, the task is a bit more exhausting.

Today, December 22, is expected to be the busiest day of the year for UPS, as its worldwide team of brown-shorts-loving employees prepares to deliver an estimated 36 million packages (up from 35 million in 2014). Central to this process is Worldport, a 5.2 million-square-foot sorting facility in Louisville, Kentucky, where much of the hardest work is accomplished—and typically between the hours of midnight and 4 a.m., when planes from UPS’s fleet of 237 (that’s 28 more than JetBlue has) land at a rate of about one per minute.

The 90-second timelapse video above, put together by the Associated Press, provides a fascinating summary of how it all goes down. It may be enough to convince you to shop early next year.

[h/t Associated Press]