4 ms·

I'm assuming you mean subjective time right? Because you can't cover 2.578 million light years in only 28 years moving at c from the reference frame of Earth.

• akvadrako 9y ago
  All time is subjective.
• lodi 9y ago
  Right, the people onboard the spaceship will only perceive 28y to have gone by. People on Earth will perceive the spaceship accelerating away for millions of years.