After the card is dispatched, it usually takes anywhere within 2-5 Business Days to reach you. When I last checked on the CIC website, the 6 weeks is a standard waiting time they have considering that the PR cards are dispatched through regular Canada Post. I think the CIC just wants to give Canada Post more than enough time. Anyway the guidance is that if it has been more than 6 weeks from dispatch and still not received, only then will they take further action ... thus the standard line of 6 weeks time to deliver.