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So here it is : we are agreed that the minimum differences in mutations would require one fixation in the population's overall genome every three months, with one fixation in the coding regions every 8 years? Yea or Nay?

That works for me. In fact, since the whole "problem" is how to account for whatever differences there are, it doesn't really matter to me about the coding genes. So for me the supposed problem is in accounting for all the differences. (See? I'm generous too! :-)

I wish every crevo thread had this spirit about it. This was no trap- I do not know what the answer to the next key question is either. Clearly, we need to know how long it takes for a mutation to spread throughout a population of humans and or chimps (with a reasonable estimate of population size for both groups during the time in question).

Note this is not quite the same thing as the cheetah question. I will grant you that the King Cheetah is a recent addition to the type, I suspect some of those others with more subtle coat differences are just the result of alleles that were already present in the one or two breeding pairs left during the bottleneck. Still- We don't need to know how long it takes for novel mutations to BEGIN in a population, we need to know how long it takes that gene to spread throughout the ENTIRE population.

In other words, if we could capture 100 cheetahs and look at their genes right now, the odds are that ZERO would have the allele for King Cheetah coating. That new mutation is only in a tiny part of the population. In this exercise, we are talking about 1.6 million coding and 42 million possible non-useful genes that are DIFFERENT in chimps and humans. Not different as in "some humans have a gene difference that every chimp lacks" but different in the sense that "EVERY human has this gene difference that every chimp lacks".

Let's start with population size. As a creationist, my position is that humans are introduced < 45K years ago, so I do not want to put words in your mouth on this. Please ping some evo help on this if you feel it is warrented to get a good estimate.

1) How big was the early population of humans and 2) How many population bottlenecks did humans go through (times when they were reduced to less than a 20 breeding members.

We need reasonable estimates for those two, then we can (I hope) wrap it up.