I actually think the timeframe works out perfectly. With two weeks you can have something complete enough to watch people use (or not) what you intend to build a business out of. At the end of the day, it's hard to learn much until you see people use it. A great deal of my time at Microsoft was spent proving that our users didn't do things the way we thought they did. We never could've done that until we had something real.

The intent is for this prototype to generate the exact "added ideas" you suggest. Two weeks doesn't seem long enough that the whole world is likely to change out from under you... especially if you have nothing to show people.