I guess, further an application gets away from the standard range, higher the chances become of it getting ignored, more. From the forum posts, it seems people still keep reporting PPRs around the six months mark (most of the cases 7-8 months), as it still adds some value to the secondary targets, like;
"80% of applications were processed within the 6 months (standard processing time) while only 20% took longer than that, of which another X percentage was processed within the 8 months."...
We rarely get to see an applicant reporting, "WOW, finally got my PPR after 11 months, or, after 13 months, after 14 months, and so on..."