Writing a simple table view based app can be done in a night. Making something that is actually useful, beautiful and performs well will take much longer. This

Writing a simple table view based app can be done in a night. Making something that is actually useful, beautiful and performs well will take much longer. This is where things like writing the API consumer bits, handling persistent data stores and so on come in. Then you need to polish it. It's not so much about the language or framework as they are great once you learn them, it's just that the standards are set very high in the App Store (at least if you wish to be taken seriously).