en, that is a difficult question for me, since i ve learned hanzi when i was a kid, and by now i ve no idea how many words exactly i ve learned.
i guess that maybe u have to memorize at least 1,000 hanzi, and of course u have also to know lots of
words which is made up by these hanzi. i think that isnt a easy job for the foregner.
but anyway i hope u can make it!