An Anti Social Version of Mafia Wars - Need some advice...

However much people praise social medias/social networks, when it comes to most games, I prefer to play them alone or with a small trusted band of friends. Now with that in mind, from a programming aspect (one of my weaknesses), roughly - how many hours do you think it would take to re-create a Mafia War like game with the following caveat?

* Programmer has access to a fake prototype (made as a website) to see game layout and game play features
* Single player only - no multiplayers feature
* Standalone game with no network connection (no need for servers, etc...)
* Graphic are only 2D - it's Mafia Wars/Vampire Wars type graphics
* Combats/Damages/Inventory/Abilities all similar to Mafia Wars - no animations

To summarize imagine "Mafia Wars" as a standalone, single player, with no network connection, no need to purchase "Loyalty points of whatsoever", no ads to buy the latest gizmos for only $9.99.

How would you go about it to make such a game simple, easy, cheap? Any thoughts would be much appreciated

I was thinking of putting the data into a simple database and create templates for the GUI layouts so the game can be updated/modified easily.