How many hands do you need to be comfortable with the data?

[ihardlyknowher]

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It should be noted that all of these calculations assume that WR is normally distributed, which it is most likely not.

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I would bet quite a bit that WR cannot be normally distributed. I'm working on a better model, but it will take more data, time, and possibly smarts than I have.

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My gut is that is skewed to the right (especially in games where there tend to be 3+ players to the flop) and that is is leptokurtic (since an experts WR is ~0.03BB/hand and VPIP ~20%, 80% of the hands will have a WR of 0BB; thus, a very large number of hands are concentrated very close to the mean).