How much time does it take to prepare for competition?
That’s a tough question to answer. It varies so much for every competitor. Though hydro power concepts are not difficult to grasp or master, this is still not a trivial problem to solve. It is an open-ended engineering problem with no one “right” solution. This means that you probably can get within range of a competitive design quite quickly, but that you can also refine your entry in a great number of ways.