Hi Indman,
How do you know for sure that it is counted from MR receiving date and not Visa stamp date? Pls provide some backup.
Also, I just wanted to add some more info. I have seen people facing problem while applying for citizenship or renewing PR card (after 5 yrs) who travel and leave Canada often and spend terms staying outside of Canada. You will be asked of all your visits and terms outside of Canada. If you stayed outside too much (even though you spent at least 3 of 5 yrs of the PR term), you will be seen as not economically established in Canada and the PR renewal will pose problems. It is recommended to have a good initial stay at Canada so that no such problems are faced at the end of 5 yr of PR status or when applying for Citizenship.
It is advised for PR holders to have lived at least 3 of the 4 yrs before applying for citizenship. Hope people keep this in mind to not get troubled later. Be careful, countries like Canada and US can send you back during the renewal of next PR term. Don't give them any chance.