How many earth years will it take to reach Andromeda galaxy?

Answer 1

Just like any other trip, how long it takes you to get there depends on
how fast you travel.

Here are the times you should plan on, for a few different choices, to the
Andromeda galaxy:
-- Walking, 3 miles per hour . . . . . . . . . . 558,846 billion years
-- Driving, 70 miles per hour. . . . . . . . . . . 23,950 billion years
-- Passenger airline, 500 miles per hour . . . . 3,353 billion years
-- Speed of a radio wave or light wave . . . . . . . 21/2 million years.
Apparently, the speed of a radio wave or light wave is the only practical choice,
since the whole universe is less than 20 billion years old.

Answer 2

Traveling at the speed of light, it would take about 2.5 million years to reach the Andromeda galaxy, which is approximately 2.537 million light-years away from Earth. However, our current technology does not allow for travel at the speed of light, so it would take significantly longer with our current spacecraft capabilities.