User blog comment:Adjoint/Endurance Champion - 10 Laps - First run/@comment-27649740-20160323150806/@comment-25956839-20160324074920

See the comments at the bottom of EK for the requirements. Difficulty is subjective, it will depend on how 'slowing the bots' goes, it can be as easy or difficult as you make it. I once ran the 10 lapper with a 911 with R$ upgrades :)