Thanks for the comment Grace Grażyna Tallar. You are correct that the broader the skill the less possible it will be to learn.
I don’t really see a language as a skill actually. It’s a subject. It’s a topic. A language is a wide net of sub-skills. It’s certainly possible to go from 0 to something in a language.
I don’t remember what I wrote in this article, but I learned the past and future tenses in Spanish during my 15 hours of practice. When I got to Spain at the coworking space, I was able to have light conversations thanks to that. For people using the language as a way to travel, they might not need professional level. But for someone like me who wanted more out of the language, I definitely practiced a lot more than 20 hours.
I’m curious, what skills would you say we should strive to learn to a professional level?