Translations:FAQ/10/en
From Gentoo Wiki
Gentoo is very actively maintained, and the entire distribution uses a rapidly-paced development and distribution method, termed rolling release: new and updated packages are frequently added to the Gentoo ebuild repository, relevant patches are rapidly applied, documentation is updated on a daily basis, and Portage features are added frequently. The fast turnaround cycle does not compromise on quality: packages start life in the testing branch and are only moved into stable once proved to be reliable; generally the transition time target is a 30 days or less.