Originally Posted by
MadMojoMonkey
10k hands is a pretty good number and it has to do with variance, not the style of players.
The point is that there's not only variance in the deal, there's variance in mood, action, image, attention... Name anything that varies during the session, and you have a source of variance. (get it?)
In order to find the answer you seek, you must first state the question. Each question will require a different sample size to draw any meaningful conclusions.
For the class of questions you posed, 10k is a good start.
A question like, "Is this villain able to bluff?" might take a single hand.