Way shorter than I remember. Granted, the first time I played this I went for 100% and this time I just wanted to finish it normally.
Surprised you can even get to the final race by only doing all the stunts, bucket lists, and just like 2 races.
Really fun side thing, either way. Way better than 5's sorta lifeless attempt at the same thing. Even the map for 5's HW DLC was worse imo. There's a nice charm to this one.