It's already been done. Geneticists have analyzed mitochondrial DNA to count the total number of homo sapiens generations. They go back precisely 200,000 years, and no more.
In addition, we're the only primates who possess 46 chromosomes. All other primates have 48.
Something to keep you awake at night.
Wow, I was just speculating. The 200,000 years to arrive at Eve is based upon assumptions on mtDNA mutation rates, which could be 10-20 times higher, per this article:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.541.4970&rep=rep1&type=pdf
“It’s already been done. Geneticists have analyzed mitochondrial DNA to count the total number of homo sapiens generations. They go back precisely 200,000 years, and no more.”