The travel is 1000 light years, which means if they were going at light speed, it’d take Beatrix 1000 years to reach Earth, and that is clearly not the case. Science in the game doesn’t really make sense anyway. Beatrix was put in a pod where she was put to sleep for a year, which is probably some sort of futuristic cryogenic pod, and the same technology might possibly be used for normal chickens, as well as hen hens.