mine was 6 hours, 41 minutes and 29 seconds
i did it on level 5 also using my junkman ford gt, bet you can't match that and it took me 2 days. I'm not the type of person that plays games non-stop, i take a lot of breaks, i spend a lot of my time outside.
Longest I have is only like 20 minutes on level 4 or 5. Looks like I have to try alot harder to beat you baseballnut!