Place butter in a medium saucepan over medium-low heat. Cook 20 minutes or until solids have turned a nut brown, stirring occasionally. Skim solids from surface of melted butter; discard solids. Slowly pour remaining butter out of pan, leaving remaining solids in pan; discard solids.
Only took 13-15 minutes for me. I read somewhere else that you shouldn't stir while the butter cooks, so I let it be.