After an evening business class, I came home and realized a comment had irked me.
"How long will we study English for?"
People's minds are conditioned in a way that there will be a time where they will become fluent in a language and they'll never have to study it again.
That's not how ANYTHING works in life. If you don't use it, you lose it.
Regardless if you're trained by me or someone else, you have to learn from now until you don't want to learn anymore, and at that point, that's when you will become lethargic.