There are quite a few species that have lasted much longer than two million years.

e.g.: https://www.oldest.org/animals/species/ https://www.smithsonianmag.com/smart-news/respect-sharks-are...

edit: Just to be clear, I wasn't disputing the idea in essence. I do think that a large fraction of species (especially mammalian species) have the potential to gain sentience over that time-span, given the right selective pressures.