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I have received Portal invite P1 and final decision, how long should it take to receive P2?

When my status will change from worker to permanent resident, do I need to change my SIN immediately or just before the expiry date of my temporary worker SIN?

For P2, it depends, could be several days, 2 weeks and I have seen some wait for over a month. You just have to provide the information they ask, make sure it is correct and wait and see!