How long does it take to learn Spanish completely?
How long does it take a average person to learn Spanish completely as in know every word and phrase? 
7 Answers
Every word and phrase?...I would answer never. I would even go as far to say that no one person could reach 90%, not even a native. A person who knew 90%-95% of the English Language would have to know nearly 1 million words, which includes technical, scientific, and medical. And thats just words, not including phrases, slang, idioms, etc. Like my professor once told me, "No one ever stops learning a language".
Spanish for example; A Spanish native living in Mexico would probably only know his/her dialect from their home town. Factor in dialects/vocabulary from other towns in that state, then those from other states of Mexico, and then those from other Central American countries, then those from South American Countries, then those Spain and Europe, not to mention those spoken in the Carribbean and the U.S.
Also, languages change and grow on a daily basis. Even if a person knew 100% of a language today, by tomorrow there would be new words to learn.
Fluency in a langiage is different. It all comes down to the individual. How often do you study? How do you study (listening, writing, reading, speaking), What do you study? and how hard do you study? A travel abroad student could attain fluency in less than a year if comlpetly cut off from their native language and with enough interaction with the new one. An independent learner could even learn in one year with enough discipline. People give estimated hours, but it only depends on the learner. If someone spends 300 hours only looking at vocabulary flashcards, they're still gonna have a hard time speaking the language if they don't practice grammer. A peron who spends 300 hours reading Spanish books and watching Spanish soap operas is still gonna have a hard time speaking it if they don't practice conversing with someone.
300 hours! Jeeze! Speaking as someone who spent 50 hours a week learning Czech for a whole year.. WOW
I got to about B1 level in Czech.
http://how-to-learn-any-language.com/e/languages/spanish/index.html#time
On here they say about 200 hours if you already know a Romance language and 300 hours if you don't should see you to reasonable fluency.
HTH
It takes as long as it will take you to learn English completely -- many years!
I've been speaking it all my life ( a few decades), and I'm still learning… Of course, I'm just a dumb ol' lizard.
I mean, seriously - it will take you about as long as it took for you to learn English fully and perfectly.
Euhmm... I think the good answer for this would be a lifetime.
Because even a native will not know every single word used in his language, this goes for all the languages in this word. Ofcourse a native will know between 90% and 95% of his own language. but to know a language 100% you need to do a very intesive study for many years, and even then you might only know 99%.
A whole life!
