In the rain, in the car, for 35 minutes, I did a bit of German. I listened to the first chapter of the first Harry Potter book while reading along (also in German).
That’s close to 5000 words, or about 250 sentences.
And what did I learn? Nothing!
That’s right, in terms of declarative knowledge I can’t claim to have learned any isolated fact. All I gained was a degree of procedural knowledge. I got a little better at recognizing many things.
To my mind, that’s better. But these days, Educational institutions generally value declarative know-how over the procedural know-how.