remembering all your domains

Without looking at your portfolio how many of your domains can you write down on a piece of paper. Would this number signify anything important and could this be considered the best size for a portfolio to have. Everyone's welcomed to elaborate on this subject, but keep all comments...

Without looking at your portfolio how many of your domains can you write down on a piece of paper. Would this number signify anything important and could this be considered the best size for a portfolio to have. Everyone's welcomed to elaborate on this subject, but keep all comments...