Time Commitment: Roughly 5 hours

Step 1: Championship Beginner run (Set to 1 lap) (Beat all stages- you just need to get top 3) Step 2: Championship Pro run (Beat all stages) Step 3: Championship Master Bonus run (Beat just the new stages) Step 4: Spam Russia (All Champs) for about 3.5~ hours -- stop when you unlock Speed Demon Step 5: Cruise the world run (any difficulty)

You should have Speed Demon (fastest car) and all of the courses. Access them all from the practice menu.