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This is me reaching 21.63km in the Neverending Pit in the Rayman Legends Challenge App. (Wii U) This level is extremely repetitive and it takes forever (This run lasted for an hour) so I shortened the video down to the first and last three kilometres.
Unlike in Infinite Tower/Land of the Livid Dead, none of the obstacles in this level are glitched so you could technically go on forever. SpearMick (The #1 ranked player) managed to reach 60+km once!
The best score I got before I stopped playing the game was 43km: i.imgur.com/N81qgxr.jpg