After how many hours did you like start to understand and learn through immersion?
It's a hard question because I'm really not close to understanding everything even now, but I remember right around the 250-300 hour point things clicked in a big way and that's when I first started understanding the meaning of like anything in real time without any effort. It was extremely rare then, like this would happen once or twice in an entire video. Maybe sentences is even too strong of a word for it lol. People who main reading could get there a lot faster. Also I didn't study grammar lol