how many years does it take us to reach the nearest star frm the solar system?

I do not know.The nearest star system is alpha-centauri of which proxima-Cenaturi(star),is the nearsst.But it has not determined,as to how long it will take to reach the same,as Pioneer 10 and 11 sent opposite directions,of the Solar system,were found to slow down a bit.This was attributed to the Gravity of the dark Matter present.

it takes some light years to reach a star