So the previous guy says we got to find negative energy that is more energy than the universe currently contains. And the next guys say: no you don't need negative energy, we can do this on positive energy. Just more energy than the whole universe contains and the next guys say you don't need more than all the universe contains. You just need a lot. How lot? More than Dyson sphere lot.

How much is that you may ask? Let me tell you: more than you got in as many generations as you can imagine. It means constructing something that contains all the energy coming out of a single sun. And according to these guys the energy level is thousands to millions to billions of suns for this to work.

To do what? To speed up a harvest or slow down someone's life. No one is that rich or ever will be.