How long would it take to travel to another galaxy?
There are some small satellite galaxies of the Milky Way galaxy, but let's consider our largest neighbour in the Local Group, namely the Andromeda Galaxy.
This is situated approximately
That means that from the perspective of the people who stay at home, a round trip would take at least
Note however, that the traveller(s) could experience significantly less time, if they travel with sufficient speed.
For example, if they used a spacecraft that accelerated constantly with an acceleration of
Returning home the same way, the traveller(s) would experience another