What are the longest hair extentions you can get?

my hair is to my chest but i want it to go almost to my belly button how long can i get extentions?What are the longest hair extentions you can get?
i get 18 inches and that goes past my bra so 22 should go to ur belly button... depending on how tall you are.What are the longest hair extentions you can get?
I know there's 22'; ones out there, but I don't think that will make it to the belly button.

shell necklace