I did my landing yesterday by flag poling at Rainbow bridge. The officer told me that it would be 3-6months. Although, she did mention that she was telling me the upper limit and I might get it sooner.
My timeline:
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ITA: July 17, 2015
AOR: August 30, 2015
Additional info requested (CELPIP): September 8, 2015
Got PPR email confirmation: Jan 13, 2016
Sent Passport: Jan 19, 2016
Passport delivered: Jan 20, 2016
Application approved and closed on CIC website: Jan 29, 2016
Passport returned from Ottawa on: Feb 03, 2016
Became PR at: Niagara Falls, ON (3322)
Became PR on: Feb 03, 2016
Waiting period my PR card: 3-6months