Perry's Rock

As most of you know, I no longer believe the term racist to have much utility any longer.  Most of us don't agree on what we mean when we say it.  So the controversy of the rock and its name at Perry's ranch makes me wanna yawn more or less. I do have one thing I want to know though.  Once the Perry family owned the place, how long did it take before they painted over the rock?  If they didn't do it damn near immediately, well, I'll make some inferences about character.