I wonder how fluent (in terms of vocab) he can become in each? And if he'll remember them. Richard Francis Burton, supposedly learned almost thirty languages

I wonder how fluent (in terms of vocab) he can become in each? And if he'll remember them. Richard Francis Burton, supposedly learned almost thirty languages - and from what I've read - he would study a new language - while throwing out another. http://en.wikipedia.org/wiki/Richard_Francis_Burton http://en.wikipedia.org/wiki/Richard_Francis_Burton