The last three images in my gallery are on Konica that expired in 1995 (grain bin, flag and overpass). Those were from a darkroom estate sale, and according to the wife they were kept frozen. So, it appears to me that the stuff keeps pretty well . . .in the freezer.
Those were developed in PMK too, and I would be happy to give you the times but my darkroom is in deep storage.
I made the mistake of shooting frivolously, assuming the film would not be of any value. If you have several rolls, it will be worth blowing one on a test.