Two-week tours are great. I've been on a few. Nothing wrong with one-week tours, either. And in fact, some of my most memorable tours have been 2 to 3 days. With my current commitments, it is tricky for me to get away for longer. No matter, I make the best of my present situation, and perhaps at some point in the future, I will be able to take the time for extended touring.
It's not how far you go, but how much fun you have!