Illinois illustrator Eric Maruscak has a history of creating large scale chalk at the Anime Central convention. This year, his work marked FUNimation's release of Lupin the Third: The Woman Called Fujiko Mine.
Last year, he created a 9' wide x 12' tall Madoka Magica chalk art mural. The work took 7 hours to sketch, and an additional 22 hours to color live on the show floor, for a total of just under 29 hours from start to finish.
Shiftylook Chalk Art Time Lapse from C2E2 2012
The Legend of Zelda: Ocarina of Time 3D Chalk Art Time Lapse
Otakon Chalk Art 2011
NY Comic Con Yu Gi Oh Chalk Art Timelapse