This was my timeline back in 2010 if it's of any help to you at all:
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We received your application for a permanent resident card on January 4, 2010.
We started processing your application on March 5, 2010.
Your request for a permanent resident card was approved on March 5, 2010. You will be notified by mail within four weeks and invited to pick up your card at the CIC office closest to you.
You have received your permanent resident card on April 28, 2010.
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Also, according to posts in the below thread, the average waiting time (including postage) is up to 2 months...
http://www.canadavisa.com/canada-immigration-discussion-board/pr-card-arrival-timeline-t73191.465.html