http://www.canadavisa.com/canada-immigration-discussion-board/fbi-pcc-t247817.4890.html
ategory........: FSW1
Visa Office......: NDVO
NOC Code......: 4011
Pre-Assessed..: Yes
App. Filed.......: 10 December, 2016
AOR Received.: 10 December, 2016
Med's Done....: 26 November,2016
Passport Req..: 10-03-2017
NDVO issued PPR to FSW ON 10/3/17 WHOSE MEDICAL DONE 26 NOV2016
so 3 months time is true
BUT IT TAKES ABOUT 3 MONTHS AFTER YOUR MEDICAL IS RECEIVED BY CIC
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=983&top=4
for permanent resident applications, it normally takes three months after our medical office receives the medical examination results from the Panel Physician before we will contact you regarding the next stage of your application. This is true only if you have already complied with our other requests (e.g. to submit other documents).
for all whose medicals done in dec 2016 or jan 2017 first week please pack your bags 8)
We should have got our PPR in March'17. But we never know.
You can see many people even packed their bags also with confidence.