on paper, it is every 10,000 km. Other than that, you may swap the tyre positions especially you have negative camber settings to balance out the tyre wear.
http://www.shelbysupercars.com/images/world-record.jpg
Shelby Supercars (SSC), manufacturer of the ultra high-performance Ultimate Aero Twin Turbo, set the new "World’s Fastest Production Car" record earlier today...