Long feeding times

At the hospital I was told that 20-25 minutes of BF was good. Anything after that I was being used as a pacifier. Now, at almost 3 weeks, my sons been pushing close to an hour on each breast. It used to be 25-30 minutes but the last couple of days it hasn’t. He seems to be taking breaks but also eating. As soon as he falls asleep I pull him off but then he’ll wake up and want to eat again. And he does. What can I do to shorten feeding times? I feel like I’m BF all day lol and I need to get other things done.