Theoretically speaking, once one harnesses the power of mountain and river geomancy, as long as the seated spirit does not invite its own doom, it can practically coexist with heaven and earth - but in reality, this is impossible.
At the time of the separation of Heaven and Earth, the first batch of primordial mountain gods, who could truly coexist with the world, have almost all fallen. Nowadays, one cannot even see a single one, let alone recincarnated spirits who have seized the position of the Mountain and River Gods.
No matter how one puts it, one thing is universally acknowledged that once anyone attains the divine position, one can greatly extend their lifespan. Furthermore, even if one suffers heavy damage or their body is exploding, they can rebuild their body by using the power of mountain and river geomancy.