Hi, don't worry

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It is not a SPOUSE VISA.
You can send an invitation to husband to visit you as you are legally residing in Canada. But you cannot say for 6 months because:
1. The Canadian embassy where he submit the application will only issue a visitor visa if they are satisfied about his return from Canada.
2. If he get the visitor visa (TRV) the immigration officer at the arriving airport will decide when he has to return from Canada. Perhaps it could be 6 months or less.