During the 1936 Berlin Olympics — Hitler's supposed showcase for his "Aryan racial superiority, Jesse Owens, at age 21, won four events. He tied the world 100-meter dash record at 10.3 seconds, and set Olympic records for the 200-meter (218.8 yds) dash (20.7 seconds)
In the 1996 Olympics, Michael Johnson smashed the World Record for 200m with a time of 19.32 seconds (see the YouTube video), a record which still stands to this day.
Now, that's over flat ground with no stopping and turning, but 200m is 18.8 yards longer than the 200 yard Dumpster Dash. Doing the math, without regard to the unlevel terrain and the need to stop and turn, the theoretical lower limit for the Dumpster Dash is 17.66 seconds. Practically speaking, it's highly unlikely even an Olympic great could run the Dumpster Dash in under 20 seconds.