10 minutes is quite a long time for a newbie racer and also quite some time for a pro driver to concentrate, I think however the problem would come from over heating as top drivers now a days are running there cars so highly tuned that even another couple of minutes would probably cause a meltdown lol.
How ever at our local club we now run 6 minute finals and we are observing the pros and cons.
It seem so far that the 2 wd guys are happy to run the 6 minutes without too much of a problem, but the 4wd guys are having over heating problems this is more then likely due to the fact they drive like mad men lol.
Thats my 10 pence but there is gonna be a good bunch of arguments for this. personally i am in favour of the extra time
