I learned french in 3 months aprox. while living in France. Ive arrived there without much knowledge of the language. First weeks I was feeling like an alien. Then I started to understand but couldn't speak. Then I started to use translate and dictionary to build some phrases beforehand to be able to be polite and ask the questions I wanted. After 3 months something clicked during a talk I was watching, I not only began to understand without having to think but was able to ask questions to the French guy on my side about the talk (it was about a ML algorithm). I am a native speaker of a Latin language (Portuguese).