Hey pedropil, gang;
I was looking at the spreadsheet today. From what information is available (I will be the first to suggest it's not totally accurate or complete) it appears that within 4 months of the PCC and/or Medical request being issued is when people are landing.
In our case, they requested the PCC on August 10, and they accepted the Medical (which would expire on Oct 30) last week.
From what I recall reading (I am a pretty old fart now, so my brain may not be as good as it used to be) Medical and PCC cannot expire before they issue COPR. Now, I am not suggesting at all that CIC is operating by any kind of norms at this time, as we all know they are churning through inland cases at a reasonably fast pace. HOWEVER they stated they are trying to pay attention to Medicals and PCC's expiring to help reduce cost for applicants. Along that vein, if you look at the cases where a PCC request was made on or after June 13, there is empirical evidence showing the COPR and Landing was issued within 4 months of that day.
With this in mind, I would be interested to see who/when people land to see if that is at all correct, or if my crystal ball needs more tweaking...