Your wife can stay 6 months from the date she entered Canada. She can also request an extension for another 6 months on a condition that you will still have a valid work permit at the end of the extended 6 month period.% P, [# g; {6 A" ?
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The 3 month validity you mentioned is not the period of time your wife can stay in Canada. That is the time your wife must enter Canada after she got her visa. 6 C- a; d4 c1 F C: ^% F% r" v) t
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For more inforamtion, you could call Citizenship & Immigration Canada. The number should be listed on the blue pages of Bell telephone books, the White pages.