Originally Posted by J011yroger
Shot tolerance is the ability to deal with a level of ball, has nothing to do with patience.
It may be that multiple definitions of the term are being used in professional tennis teaching circles. Your definition seems to make sense, but it wasn't the way the term was explained to me by a teaching pro (this was many years ago).
Here's a video of another guy using it in terms of comfort with hitting in long rallies, rather than the other definition in terms of being able to handle balls with a lot of pace.
The definition of being able to handle pace makes more sense in terms of the video at the start of this thread. The rallies weren't very long, but the ball was being hammered.