http://www.cic.gc.ca/english/immigrate/sponsor/index.asp
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Effective October 25, 2012, sponsored spouses or partners must now live together in a legitimate relationship with their sponsor for two years from the day they receive permanent residence status in Canada.
If you are a spouse or partner being sponsored to come to Canada, this applies to you if:
You are being sponsored by a permanent resident or Canadian citizen
You have been in a relationship for two years or less with your sponsor
You have no children in common
Your application was received on or after October 25, 2012
Learn more about the new conditional permanent residence measure for spouses and partners.