Greg Valentine Question

As every wrestling fan should know, Greg Valentine needs ten minutes just to get warmed up. But did we ever get an explanation (kayfabe or otherwise) for what this was actually supposed to mean? Or is it just one of those Gorilla-isms that sounds memorable in the moment but you're not supposed to think too hard about?

It meant that he excels in long matches.  I dunno, I thought it was always pretty clear.