If you do it right you can become conversation in 3-6 months, fluent takes a lot more work though, I think with the right concentration and study methods, it can take 5 years for most languages and most people, but those are often boring study methods or study methods so simple that people don't believe they work (even though they do).

BTW, I've watched a few of your videos recently, but got busy towards the end and forgot to reply