Is species longevity really an objective metric in this instance? What kind of species concept?
No those figures are of the right order. Mammalian species longevity was on the order of 0.3-1.2 million years during the Pleistocene and 3 - 6 million years in the Neogene (there is a great deal of varition between orders). Bird species were more long-lived in the Pleistocene, about 6 million years, but in this case there seems to be little difference between the Paleogene/Neogene and the Pleistocene.
Tommy Tyrberg