I hate to use the word "impossible". But, in my opinion, three weeks are just not enough even if you push hard.
I know a couple of riders who have done it (Miami to Sao Paulo) in 40 days - but, as Mark said, it was just riding hard every day. No time for breakdowns, having a beer, talking to people etc.
Originally Posted by chilango13
Thanks Mark. It was a "dumb" question! I know three weeks is pushing it, since I'm starting from Los Angeles. I guess I will just fly there and make the motorcycle trip to Brazil with ample time in the future to acutally enjoy the Ride.