So to calculate how fast she moves in Endgame, the major things we have to get is a distance and a timeframe, luckily for us Tony gives them both
* Tony Stark: Some fuel cells were cracked during battle, but we figured out a way to reverse the ion charge to buy ourselves about 48 hours of time. \[A shot of Tony and Nebula working on the fuel cells of the Benatar.\] But it's now dead in the water. **We're 1000 light years from the nearest 7-11. Oxygen will run out tomorrow.** And that'll be it. And Pep, I ... I know I said no more surprises, but I was really hoping to pull off one last one. But it looks like... well you know what it looks like. Don't feel bad about this. I mean, if you grovel for a couple of weeks, and then move on with enormous guilt. I should probably lie down. Please know that... when I drift off, I will think about you. Because it's always you.
So they're a thousand lightyears from Earth and they have at most 24 hours left of oxygen, we should easily be able to get a number from that.