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Two questions come to mind.

1) When was the last supernova observed in our own galaxy?

2) How close would one have to be to be observed with the naked eye?

1604. One could say we are overdue. I’m not sure about dust or other obstacles blocking it, but based on brightness alone a supernova in our galaxy should be visible with naked eye.

1604? Sort of; SN 1987A was visible to the naked eye at 3rd magnitude. It was in the Large Magellanic Cloud, which is almost in our galaxy but not quite. 170k light years. https://en.wikipedia.org/wiki/SN_1987A

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