Seems like the lowest I can go is 8 Minutes, no lower. Also, it doesn't seem all that good in randomizing positions because every time I used it, I never started anywhere other then the front row.
Gotta say this free drive weekend is truly the first time I've enjoyed the content of the game (even if it seems I'm never gonna be able to afford it). Only real frustration came in driving the GT1 cars at Zolder. I found the Gearbox model to be very annoying with the Ford GT GT1 as even when I was finessing the throttle, it had the annoying tendency to have that judder and it really killed my momentum several times (same for the Saleen S7R.)