What is important is NOT the construction of a rocket, or even a mission. What is important is having tested designs, manufacturing lines, and having it be CHEAP. From that, you can move forward quickly. For example, it took musk 10 years to build his F9. It will take 2 years to build Falcon Heavy. And if things go well, then Musk will likely build Falcon XX in under 5 years. But the important thing is that Musk will build it CHEAP.
OTH, SLS is simply a continuation of Ares V. Same damn SRBs. Same SME. Same J2X. The difference is that SLS is simply being pushed now with a different name. But we already spent 7 years on Ares. Now to get a TEST launch of a 70 tonne system, it will be another 7 years. The first launch of a human? 10 years and over 20 billion just on the SLS. That does not include the 10 billion that we spent on ares already. Of course, SLS will die in about 2 years when Falcon Heavy works. The FH will take up 54 tonnes at that time. Musk is follow it with Raptor second stage which will give FH 70 tonnes. All by 2016. The real issue is that FH with the raptor will still cost around 1/10 of what the SLS costs to launch. That will lead CONgress to kill the SLS (thank god). Once CONgress will allow NASA to focus on doing BEO tech, THEN we can have missions. LOTS OF MISSIONS. But we need a stable of tested equipment and the ability to do it cheaply and quickly.
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