The first ones I believe were something like 50,000 years, which figure was merely chosen first by the dead guy who agitated for using mtDNA. Even in his lifetime he was notorious by the autogoal of referring to morphologists as being limited. His remark that pre-”modern” humans lacked speech, calling them “village idiots”, and pompously and ridiculously claiming that the ability to speak came from the mtDNA. Glad that jackoff died in pain, but I’m kinda mean.
Anyway, the 50K figure was considered kinda outta there even then, far too low; it went up pretty quickly to 70K, then 100K, and has continued to trend upward even using these “tools”. :’D I’ll go not very far into the oncoming lane and predict that these results will wind up nearing 2 million, and that this will happen within ten years.
Most other studies in the 1990s showed that the parsimoniousness of the tree that the low-end Replacement advocates claimed was total hogwash, IOW, they made the conclusion fit the original assumption. One merely needs to choose the data and the assumptions carefully enough, and anyone can sell anything to anyone. ;’)
RE: “Calculus was easier, less math.”
My son will be happy to know that. His prize for passing the AP Caculus test was Calc II in his first semester as a freshman. Welcome to college, kid.