How many words do you learn in an average Duolingo tree?

I have heard that when you know around 2,000 words, and are for the most part able to put them together in a sentence, you can be considered conversationally fluent in a language. I'm sure the 2,000 word mark varies some from language to language but I'm curious if Duolingo hits this mark.

Thank you!

*edit: added a "the"