Porcelain is more stable, as mentioned. You'll still have issues if the protective glaze cracks, but it won't completely dissolve on you like earthenware would in the same situation.

I'm not sure I understand what you're referencing with the pottery. The oldest pottery I'm aware of is 18-20k years old and was found in a cave with exceptional preservation conditions. That's fairly old, but not remotely the earliest or indicative of special longevity. We have lithics that entirely predate the evolution of genus Homo (Lomekiwi tools, 3.3M years old) as an example.