North Texas Relay Challenge Gilberto Junior of O2 gives a good insights on the North Texas LMSC Relay ChallengeEach person swims 50-yards in a relay fashion. The relay goes on-and-on for 30-minutes. See how far the relay can go in that time with total yardage. By Mark Rauterkus Swim, water polo and SKWIM coach in Pittsburgh, PA, USA. Also the webmaster for the International Swim Coaches Association. View all of Mark Rauterkus's posts.