That's weird. Someone told me the more you morph the longer it goes. Like training her. So I did exactly that. And it worked. In the final battle she was morphed for almost the whole thing. Which made her a devastating adversary...

Though I honestly didn't use morph a whole lot 'cause random encounters were so weak and hardly worth it. But I did abuse it a lot too. Maybe the time span was just enough to keep it increasing? But I really think it's more the other way... but I'm just going off memories that are probably 5+ years old.