I think there is a lot of excitement knowing the race is only 5 minutes long. if you had a 15 minute race and you stuffed it at the start you'd have loads of time to push hard and catch up. In 5 minutes you don't have that option so the pressure is there to do well for the whole race.
I've run my 4wd for 20 minutes at racing speed with no issues on thermalling outdoors. it wasn't winter either is was average UK weather.
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