About how long does it take to become a succesfull FILM actress like Ellen Page or Leonardo Dicapio?

Most famous film actors start as kids, usually in really small parts, in plays, tv, and so on, Dicaprio was in titanic when he was like 18 or 20, so starting from childhood, it could take 20 or so years to hit mainstream and if you have a good role, and if people like you, you may be able to pull of a successful career.