the way it's structured gives you a lot of freedom to choose what you want to learn about. In the end, it gives you reasons for asking people questions, and the tools you need to interpret their answers.
With that said, choose something you actually want to learn about. Just like sitting through a class that holds no interest for you, surveying people about things that mean nothing to you probably won't be too fun or worthwhile. As I said before, you are essentially being given a chance to create your own class topic, don't waste it.
Another note, when plotting out how much time you need, be generous to yourself. To give an estimation, surveying roughly 100 people of as wide a class representation as possible took about 2 or 3 nights. Follow this advice and you will thank yourself in the end.