It doesn't actually take that long, it was an exaggeration. I tried installiong Gentoo on a spare hard drive. Its hard and takes a long time, having to do everything manually and from source. Crazy stuff.
ANYWAY, Gentoo, while being Linux like Android, is off topic. Just gotta wait for this midnight release and for Daz's github to crash. :3
Gentoo is an operating system built on the Linux kernel. It was initially released by Daniel Robbins on March 31, 2002. The goal of Gentoo is to have an operating system that builds all programs from source, instead of having pre-built binary packages. While this does allow for advanced speed and customizability, it means that even the most basic components such as the kernel must be compiled from source. It is known through out the Linux community as being a very complex operating system because of its daunting install process. The default Gentoo install boots straight to a command prompt, from which the user must manually partition the disk, download a package known as a “Stage 3 tarball”, extract it, and build the system up by manually installing packages.