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That seems like an extremely inefficient way of learning a language, and does not match at all my experience nor the experience of the people I know fluent in multiple languages, and it seems to go straight against a common advice which is to speak and practice early and often, as 'producing' language is much more efficient to learn it than 'consuming' it. What makes you think 15000 hours of listening would improve a…
I was guessing about about 15,000 hours I just think it has to be a lot time. I'm sure speaking helps most people who study languages simply by exposing them to more input more frequently then they would otherwise be exposed to. I just don't think it is as efficient as focusing on listening first. It will lead to having an accent, grammer issues and pauses to think about how to say things. That being said good luck f…
Working in Sweden, where tech companies speak English internally, I've been able to follow the language learning journeys of quite a few people (including some using the strategy "don't bother"), and the people who end up the best speakers (with regard to accent, grammar and vocabulary) are invariably those who try to speak the language as much as possible as early as possible.
Yes, they will have a strong accent in the beginning, but it goes away with time (though accents rarely disappear entirely). The native English speakers who've lived in the country for twenty years without speaking much Swedish daily still have strong accents.