12 years is possible, then...wow.
They will come up with efficient error correction schemes, I think, so qbit accumulation might be the limited factor.
Interestingly, this would break EVERYTHING, like anyone's bank account, etc.
Maybe this explains why gold is appreciating, although it is a farfetched idea.
After all, you cannot quantum-break a piece of metal, UNLESS, AI would make alchemy possible,

Musk will drag an asteroid back to earth the size of Rhode Island. It will be 30x the gold that's on earth at this moment.