I had my K20 in for warranty repair at CRIS earlier this year. It took nearly 4 weeks as I remember. I actually drove down there and turned it in and also picked it up. Its (CRIS) relatively small - probably 5,000 square feet, clean and seemed to be well organized. They do warranty work for Canon, Nikon, Ricoh and Pentax, along with a couple others as I remember.
My repair was held for parts and that is the heart of my observation (from the outside looking in). If Pentax could stockpile adequate supplies of parts here to keep CRIS well stocked (especially for current models - under warranty), one would have to think that the parts hold wait times would disappear. The work flow would certainly reflect this and the repaired units would be returned much quicker.
That, is the fault of Pentax and for that I do wish that they would take positive action to correct this. It certainly would appear to be a straight forward approach. For each body model, they have to have a good set of statistics on what parts are in high demand, and these should be kept at adequate supplies. I can see that if a body needs to go back to Japan that it would take longer, however their current system certainly is showing some areas that some rather simple improvements to the process could certainly reduce the repair time considerably.
This could not cost any more that what it is currently costing (in parts and labor), and their customer service would certainly rise. It just seems to be such a simple fix.......