Odd. I was wondering how fast it actually was long term, and this rate from historical record seems much lower. They cite 1.8ms/century if I'm reading it correctly with some odd cyclical thing going on. " the change in the length of the mean solar day (lod) increases at an average rate of +1.8 ms per century. "

I mean, we've added 22 seconds over 50 years. Although at current rate it would still just be 7 minutes after a millenia :)

edit You know, nevermind, that's all covered on wikipedia. https://en.wikipedia.org/wiki/Leap_second#Slowing_rotation_o...