Much too long Helio. The clock aboard ship will clock 30 years travel time. The speed of light is 186,000mps rounded off. At one light second from Earth it will take one second for light to traverse the distance to the observer on Earth, at which time the real space-time traveler is at a far greater distance than one light second from Earth and the observer on Earth, though the relative traveler, the traveler relative to the observer, is said to be the sole traveler (there, accordingly, being no other) by too many physicists on Earth,
The observer living at the time on Earth, if anyone is still alive on Earth at the time, observes (herein saying it's possible) the traveler to arrive at Andromeda 2.3 million years plus 30 years after leaving the Earth, having aged only 30 years during the voyage of observed 2.3 million years plus 30 years (light taking one year to transit a distance of 1 x 6 trillion miles of space: light taking 1000 years to transit a distance of 1000 x 6 trillion miles of space : light taking 1 million years to transit a distance of 1 million x 6 trillion miles of space, and so on and on (the truth of time stretching giving light a straight-line constant of 186,000 miles per second all the way from here to Andromeda)). The traveler is long, long, dead when the observer, many, many, generations of observer later, observes the relative traveler to arrive at Andromeda (again having aged just 30 years, and the ship's clock having just clocked 30 years of travel time).
There is a flat refusal to look at and deal in the warp capability of the geometry of space-time. A warp capability the observers on Earth would not observe other than as described above. You see, I included space as an equal in the merger of space-time. You start warping time, you have to warp space right with it as a naked singularity of space-time warp. Both Earth's and Andromeda's clocks would only advance 30 years during the time the ship's clock advanced 30 years. And that would be exactly what the Earth observer would observe for Andromeda's clock, so to speak, upon the traveler's arrival at Andromeda, an observation of relative space-time Andromeda 2.3 million years behind the real space-time of Earth and unobserved, unobservable, real space-time Andromeda.
The real space-time traveler, and his clock, was lost to relativity with the real -space-time observer almost immediately upon leaving the vicinity of Earth. Actually sooner, but "almost" is good enough for government work. The relative space-time traveler, the distorted, warped, traveler in the light, slowing ever more in time at and with the speed of light to a final rearward in time difference of 2.3 million years (give or take 30 years), never loses connectivity to the relative space-time observer (just simply distorts and warps).
And by the way, I described an "observation" made at very close to -- in fact slower than -- the speed of light. A "relative" observation. But to think that that is the reality of what is in fact a multi-dimensional picture is to be a one-dimensional stick being.
I think we are going to have very little trouble, once we are out there and able to travel under constant powering (constant accelerations / decelerations), traveling through multiple dimensions greater than one or two to get from here to there in the universe ... or rather to travel from relative universe to relative universe. Not just star to star, but galaxy to galaxy ... therefore universe to universe (which star to star and galaxy to galaxy, and broadly much more, including, vertically, much more and much less, is). We are more or less "fly over" country, not even a spec-of-dust, in such a richness of vastness awaiting our entrance, our birthing, into it.