Yes, It's very obvious you don't understand.
It takes a few hours to go through the graphical installer and have a working, functional, installed system.
It DOES NOT take a few hours to boot up the live CD. Coming from someone who supposedly runs Gentoo one would think you would know the difference between a Gentoo live cd and one of the many other live cd's out there (like knoppix).
Read the article, man. Read the article...