I have found the 10 weeks necessary for the student to understand PMI concepts and specific information necessary for the exam. It gives the student time to absorb the material, concepts and the PMI methodology which are all keys to success in taking the exam. Your test scores in the course will indicate when you are ready to take the exam and if you need more preparation before sitting for the exam.
 I've had several students take my course AFTER taking the 3-5 day course and being unsuccessful in passing the exam. I have not offered the bootcamps because I would not have a reasonable expectation my students would pass with only 3-5 days of instruction.