But if simulated neurons can create consciousness, there's no guarantee of what level of detail that simulation has to operate at in order to produce that effect.

For instance, it's (unlikely, but) theoretically possible that it would require simulating them down to the level of subatomic particles, with perfect accuracy.

Right now, we're simulating them at a much, much higher and more abstract level, and AFAIK we barely even have the processing power to do that for the time being. So an artificial consciousness from simulated neurons may (again, assuming it's possible—which is a decent assumption, but not a certainty) take decades or even more for us to be able to achieve.

The problem again is that (a) other forms of consciousness exist eg octopuses (b) I cannot get into the shoes of you or an LLM and see if I feel or think, so we only have external effects to go by. For things that look and seem so much like consciousness, I am rather cautious.