Who's advice do you take?

Juliette had her second well check appointment today. She is growing nicely. She gained 8 ounces since last Monday. I'm totally confused on what advice to follow when it comes to feeding Juliette. He doctor said to nurse her every 2-2 1/2 hours and let her have 15 minutes on each breast. The lactation consultants at the hospital say to let her nurse when she wants and as long as she wants. It's totally confusing. Bryan and I decided to follow a combination of the two and see how that goes. Feed every 2 hours but let her nurse as long as she wants. We'll see how that goes. Who knows we'll probably try something different tomorrow. Today is the first day where I can truly say that we have gotten her to sleep out of our arms during the day. She has taken to her bouncy seat. It's just a matter of having one of us bounce her in it continuously. It is amazing how much her personality changes each day and how much we learn about her. We've pretty gotten down the difference between the "I'm hungry " cry and the "I made a mess in my diaper just for you Dad" cry.