When I started to learn English three years ago I was listening 5-6 hours a day. I usually choose simple dialogues. After understanding these dialogues I listened to broadcasts which were interesting to me. I agree, if you don’t understand at least 80% of what were said you will learn nothing. I’d recommend to listen intentionally because it will help you to predict next sentences and conclusions. Then I’d recommend to watch TV series instead of films because in series the whole scenario remains the same and words often are used repeatedly over time.
I wish success in your language studies.