[saalweachter]

> If you're planning a round-trip, you'll find rather more time has transpired on what used to be Earth.

Or less, depending on the rotation of the universe as a whole.

[ben_w]

Or no return may be possible at any speed/acceleration given the expansion of the universe.

[dredmorbius]

Given that the outbound journey is already technically challenging, that's very nearly quibbling, despite cosmological accuracy.