At Party I feel that I get a pretty decent idea of their play with as few as 30 hands. Obviously, the more data I get, the better it is, but I don't see it changing TOO much. If they're 80/15 after 30, chances are they're going to be around 80/15 after 300 or more.
I use the information primarily preflop. I find it to be a good indicator of when someone is either a) playing a monster or b) making a huge, but rare, bluff.
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