From how many words were you satisfied with your understanding of Japanese

I'm at a stage where I'm starting to understand about 80-85% and now I'd like to be able to understand and be comfortable with what I'm going to hear and therefore conquer a little bit of that bit of understanding that I have left and I was wondering what that represented and for the people who have gone through it. How many words? I know it depends on the medium but I generally speak.Thank you for your response in advance.