Yesterday, I was flipping around the tv and ran across a channel showing the 1965 All Star game. The thing that struck me was how much faster the game was. The pitcher got the ball back from the catcher, stayed on the mound, got his sign, and pitched. The batter stayed in the box, or maybe took one step out to get some dirt, and was ready to hit. I started timing the pitches. They were between 15 and 20 seconds apart.
I think they are 15-20 minutes apart now.