You could be fluent in Spanish if you didn't league [MATH]
tl;dr if you play league a lot, you could be fluent in Spanish by now. Shame on you. Tsk tsk.
According to a study if you memorize 1,000 words you will be practically fluent in the language besides grammar rules which are very easy to learn.
Amount of things you learned in league: Champion's Q,W,E,R,Appearance,Name = 6 things
132*6= 792 things
Items that you probably know: 165
792 + 165 = 957
The dragons, jungle camps, baron and rift herald, memories of the game, towers, map layout, camp healths, appearance of camps, and so much other things that are too boring to think about would total to over 1,000 things.
Study here: http://howlearnspanish.com/2010/08/how-many-words-do-you-need-to-know/