i thought they were very very hard(sorry for my potty mouth). but then again, when i got them finished i had about 3 series done and a camaro. i think every b test took like 5 mins, A-10, IA about 20, and S was about 2-4 hours. the S8 test was the fastest S test taking about 20 mins. i read on here to keep it in 3rd gear the entire time and it is very easy.