Comment by Crito

While completed projects almost always take longer (git is still under active development, Facebook obviously is still paying developers to come in every week, etc), it is probably a sign of good project planning to be able to get a functional prototype out the door in under a week. It's the difference between a project with realistic and obtainable goals and milestones, and a project with a pie-in-the-sky grand vision but no idea how to get there.