How long wisdom teeth take to grow ?

im 19 i have 3 wisdom teeth, i wanna know how long they take to grow out because i have one wisdom tooth i didn't even no was there, one that give me a slight bit of pain and now i have one witch is extremely pain full no painkiller will numb the pain. how long am i gonna be suffering this pain it comes an goes it has been growing through my gum since 2009 honestly it just wont come out it grows extremely slow it has already pushed my second molar out and i still suffer from pain there is a lot of room at the back of my mouth so i don't understand why it hasn't come out yet?