A lot, by any measure.
Some bible theologians push back to support a model that entailed incurring “six 24-hour days” in a physical universe. This gets into technicalities which I, a crazy evangelical, have not been persuaded are absolutely necessary. For God qua creator and the universe being created to carry on in different time frames is a quite plausible theory by virtue of the general relativity we know. Who’s keeping score in this game, and where, is a crucial question.
I tend to side with the old earth creationist camp for this reason. That makes the earth no less special. It also doesn’t help any sane mathematical model support a theory of self sustained evolution. It also means we do not need to sweep an ancient celestial history, which counterbalances such things as our modern global warmism craze, under the rug.
I have read some of that, and it is plausible.
Six days from the viewpoint of a creator could easily be billions of years from our perspective.