A "Chief" in the R&D org recently revealed his promotion history saying "I got 1 promotion in my first 10 years and 5 in my last ten". That is just about impossible for a mere mortal. If you were that poor a performer in your early years (1 CL in first 10 years is really bad) there is no way you can recover to get 1 CL every 2 years for 10 years!
Oh wait this is rhetorical - he is in a diversity group and ~ 10 years ago is when our diversity initiative went from reasonable to insane.