Wikipedia has both dates and the delay for each version: https://en.wikipedia.org/wiki/CentOS#CentOS_releases https://en.wikipedia.org/wiki/CentOS#CentOS_releas

Wikipedia has both dates and the delay for each version: https://en.wikipedia.org/wiki/CentOS#CentOS_releases https://en.wikipedia.org/wiki/CentOS#CentOS_releases 6.0 had a 242 day delay--I never really paid attention to why, but that was a very noticeable lag compared to their previous release schedule.