breast feeding on demand?

Breast feeding on demand? How do you guys feel about it? At first I thought it was okay but LO was attached to me all day long. Am worried about when I have to go back to work so I'm trying to adjust her to a feed/sleep schedule as recommended in the book "Blissful baby expert." 
I love breastfeeding but I can't live life with my baby hanging from my boob all day long.