What is the length of billie joe armstong's hair?

I'm trying to get my hair styled like his, but I know I need to grow my hair out more. I 'm just wondering how long my hair needs to be in order to get it. And to be specific, http://hookedonhouses.net/wp-content/uploads/2009/09/Billie-Jo-Armstrong-Green-Day-photo.jpg this is the specific way I'm trying to get.