It took me nine hours. When I demonstrated the Analytica model, jaws dropped. The telephony engineers were literally tearing out their hair because they said it took them 13 months to construct a similar model in Excel. After the model was completed they discovered that they had inadvertently forgotten to integrate a sensitivity analysis. Excel is so rigid.
Every variable has to have a header, function, a logic table, and more.
In comparison, Analytica uses a natural approach. It enables any level of user to follow the logic of a decision. It's as easy as looking at a road map. Plus, all of the computational data is transparent to the user, so it's much less intimidating. Literally thousands of scenarios can be simulated and analyzed simultaneously.