There are different modules and you must finish one to get to the next one. In the end you'll have to solve a case study which will basically be you answering a set of multiple choice questions to solve ethical dilemmas and reaching a final decision.
You can do it in a single day as well. It isn't difficult at all. You'll have to read through the material and then answer a set of questions related to those and then the final case study as explained above.
Best of Luck.