release schedules

IT Wire: "Since the Ubuntu GNU/Linux distribution kicked off five years ago, it has been churning out release after release every six months."

Phoronix: "While the X.Org developers are responsible for a lot of critical code and much of it is quite old and massive, they are often challenged by hitting a release on time and often face multiple release schedules before coming close to delivering a new X Server / X.Org release"