I've thought about this before and I'd love to try it with my 5th Scale but the problem would be keeping heat in the tyres so it didn't spin out round the bends.
I recon with a good engine and right gearing it should be good for 60 and if you can keep the traction it should be able to keep up a good speed through the bends so it would take about 20 mins.
You'd need bloody good cooling to run at full tilt for 20mins tho and a fuel tank twice the size on a normal one.
I'd also love to do it on a mini moto
, with ear plugs of course.