That was done by going through town instead of the outskirts though. Not sure how much that might help or hurt, probably no more than 30 seconds one way or the other is my guess.
If you do the math from our results of the 2006 Cycling Classic (5 laps around the dump loop in August), the best was 45:12 by Calvin Allan. There were multiple mid to upper 45's and 46's as well.
http://www.spondoro.com/results/cyclingclassic/2006…