How long does it take for the galaxy Andromeda to reach ours?

The Andromeda Galaxy is currently about 2.537 million light-years away from the Milky Way. It is on a collision course with our galaxy and is expected to collide in approximately 4.5 billion years. This event will lead to the eventual merging of the two galaxies, forming a new galaxy often referred to as "Milkomeda" or "Milkdromeda."