Depends on your def of "long run". If by "long run" you mean a virtual 100% certainty of not being a loser, well 3N0 (9x N0) would give you a 99.865% chance of being at break-even or ahead of the casino. If you want even more 5N0 (25x N0) would give you a 99.99997% chance of being at break-even or ahead. Because certainty of being at break-even requires exponentially larger sample sizes having a low N0 to begin with is essential. 25x 35,000 is a lot longer than 25x 10,000.
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