Comments of chapter undefined of Harry Potter : Reborn as Hagrid

The transfiguration is not eternal, it only lasts for a while (probably as long as you continue injecting magical energy into it), and then it returns to normal, since otherwise the magicians would transfigure gold, gems, etc., and screw up the bank of the goblins and any economy, the That makes the transfiguration eternal is the philosopher's stone of the magician who has lived more than 600 years.