As viewed from Earth. But as viewed by those onboard the ship making the trip, it'd happen in the blink of an eye. And they could make the trip back in another blink... 'Course, at least a million years would've passed back on Earth. Things might be a leeetle different when they get back.
So, 500,000 years to those onboard would be in a blink of an eye? If the trip took 1,000,000 years it take two blinks? How much time is in a blink?