well it's like this:
most schools will boast that they have finished courses within 3 weeks. it can be done but you need all the ingredients - brilliant weather - a student that can come in literally every day and a student that has the ability of a student of TOPGUN (oops and obviously the wedge to go with it!).
most of the 3 week courses take place in the states where they are near enough guaranteed of the weather.
on a personal note i normally do not recommend crammer courses for the simple reason that normally if you cram for something after you have passed you normally dump the knowledge.
any more questions - let me know.
regards
an old ops man
