[chimi]

By some back of the napkin calculations I did once, I found that a couple billion years is enough for the tectonic plates to have completely recycled themselves into the mantle, erasing any structures built on them.

[MauranKilom]

Correct, the stratigraphic record is 3.5 billion years old. At least if this (https://xkcd.com/1194/) xkcd is to be truested.