Yesterday I tried building an endurance map in under 90 minutes. It was quite the challenge! I had to sacrifice things like signs and more detailed scenery. Overall I like the way it turned out though.
This video is a timelapse of the 90 minute building phase, and my first run on the track.
Wow!
I'd say you managed to pull it off quite well. Nice job!
It's one thing to build a track of that length in such a short time, but to build one that actually plays well... Impressive.