There are many possible answers depending on the type of application. How difficult is the view? That can be one person, or a very small piece depending. In som

There are many possible answers depending on the type of application. How difficult is the view? That can be one person, or a very small piece depending. In some types of games, AI can be enough for one person. Business logic or the model, depending on the application, can be two thirds of the work. Further, programmers vary on productivity. My suggestion would be to put out a preliminary design then split it into rough time estimates. Then, everyone pick a task and start working. As you go, you'll get a better idea on what takes the most time and adjust accordingly.