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The only requirement is that you leave Canada and re-enter. I did this myself for a Permanent Residence visa and I literally crossed over the Rainbow Bridge to the US, and turned round and came straight back. It's not a problem. (The conversation with the US immigration official was interesting. "What is your purpose in coming to the US? "To leave." "How long do you expect to stay here?" "About five minutes".)

As pnuts pointed out, you will need to qualify for entry to the US for that brief time, but as Australian that shouldn't be a problem.

I think, in retrospect, I didn't even need to enter the US. I just needed to exit Canada.

The only requirement is that you leave Canada and re-enter. I did this myself for a Permanent Residence visa and I literally crossed over the Rainbow Bridge to the US, and turned round and came straight back. It's not a problem. (The conversation with the US immigration official was interesting. "What is your purpose in coming to the US? "To leave." "How long do you expect to stay here?" "About five minutes".)

As pnuts pointed out, you will need to qualify for entry to the US for that brief time, but as Australian that shouldn't be a problem.

The only requirement is that you leave Canada and re-enter. I did this myself for a Permanent Residence visa and I literally crossed over the Rainbow Bridge to the US, and turned round and came straight back. It's not a problem. (The conversation with the US immigration official was interesting. "What is your purpose in coming to the US? "To leave." "How long do you expect to stay here?" "About five minutes".)

As pnuts pointed out, you will need to qualify for entry to the US for that brief time, but as Australian that shouldn't be a problem.

I think, in retrospect, I didn't even need to enter the US. I just needed to exit Canada.

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The only requirement is that you leave Canada and re-enter. I did this myself for a Permanent Residence visa and I literally crossed over the Rainbow Bridge to the US, and turned round and came straight back. It's not a problem. (The conversation with the US immigration official was interesting. "What is your purpose in coming to the US? "To leave." "How long do you expect to stay here?" "About five minutes".)

As pnuts pointed out, you will need to qualify for entry to the US for that brief time, but as Australian that shouldn't be a problem.