I spoke with my source at the PR foundation and that is what I understood regarding the keys:

* The titles of the keys are Key one, Key two, Key three, Key four, Key 5 and Key 6.
* There are no promises to be made before you start with the Keys, only that you are of legal age and at least 18-years old.
* No one determines when a person is "ready" to progress to the next key. That is a personal decision made by each person.
* You get key one, watch the material at your own pace, and when you are ready to move on to the next one, you send it back asking for the next one, and so on.
* Same for key 6, only difference is that you get invited for a viewing of key 6 at a location near you.
* There is no involvement of "instructors" on key 6, just a technical operator and a usher. If you have a medical condition or are disabled they can come to your house or hospital and show key 6 to you privately. She told me that thousands of key 6 showings have happened since 2000 and that is has been very successful. People that have already learned the techniques can also ask to be invited to watch the key 6 presentation again to dispell any questions they may have.
* She also said that PR designed the keys based on trust, and that maybe some people may attempt to "cheat" the system, but that in that case these people will be cheating themselves, as key 6 without preparation does not work, and that PR trust that people are honest.

Now, I reckon someone sincere with time on their hands could get through this in a week, so why does it take 5 months?