It could take 10 years or it could take 20 years. Wouldn't 10 years be better for everyone? China has a "can do" attitude. We seem to have a lot of obstacles in the US. Attitude is definitely one of them. The Manhattan project and the Kennedy moon challenge couldn't be done today. A skunkworks methodology goes a long way:
http://en.m.wikipedia.org/wiki/Skunk_Works