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,

To tell you the truth I'm still not sure they are not just dealing with randomness and they are basically herding cats.
But when you think about it if you can distill randomness fast enough then you can find any answer so the error correction is actually the real computation.
They may be a snake eating their tails.

I think it is highly possible that the closer they get to the answer the more exponential the problems become, similar to reaching the speed of light.
Yeah what is meant by error correction is running the same computation over and over and running stats on the results. With millions of physical qbits you would run thousands in parallel.