Not an expert on black holes. What I know is that to an outside observer, an object will never truly enter the hole, just linger around the event horizon and their wrist watch will be at zero. But from the black hole's point of view, it has an unending stream of particles moving at the speed of light at the very least. Wouldn't all of these particles most be the most powerful things in the universe? Because people say that only light can travel at c. But what if regular objects could go at c? The impact would be devastating. The impact would cause a giant nuclear explosion of the universe. For all I know it could spawn a new universe in a new dimension. Thus I believe black holes, in our perspective, last forever since we are trapped outside of their event horizon (bubble). But to a black hole, if it had a point of view of its own, it has a short life of maybe a few seconds or more. And it creates a whole nother universe or BB. Thus this is a New Universe, contained within its own dimension! And thus there are multiple universes, within Bubbles of event horizons. It is like these Bubbles are shields preventing the universe from coinciding with our time! this is my theory feel free to either give nobel prize, or shoot holes in it.