They are just a 2 hour exam. I took about a month to study for each instead of my normal 4 months for full exams but I know some people who only took a week to study for them. I would say most think they are easier than the full exams since they are shorter and multiple choice with no guessing penalty but they still require time and attention.
I know some great online courses, but I don’t know how much time they take. My sister took one of those courses, and it was for more than two months, so I think you can easily find some 10 weeks courses. However, I don’t know how great they are because my sister still failed the exam after taking that damn course. Actually, I want to start my own course with a friend of mine because we have enough knowledge in this domain and have worked with it for more than five years. We have already ordered some certificate templates from create.vista. Now we only have to solve some formalities.