Instead of consuming four 12-ounce beers as in the standard beer mile, the chunder mile requires four imperial pints (20 fluid ounces each) to be chugged out of pint cups. That's nearly double the volume of beer - 80 ounces in the chunder mile versus 48 ounces in the standard beer mile.
Jim Finlayson of Canada, the OG beer miler, set the world record on May 13, 2016 in Victoria, BC in a time of 11:39, which shattered the previous world record by a couple of minutes. He made it the full 8 beers and 8 laps without vomiting—though he vomited shortly after finishing. And he did it as a 43-year-old. Take a look at this beast of not only the beer mile, but now the beer two-mile.