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Many people prefer to use a fractional Kelly system, with a bankroll c times the bankroll recommended by the pure Kelly Criterion. Common values of c range from 2-4 for individuals.

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If applied to investing in the stock market, is the range of c for a typical investor very different from this?

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Typical individual investors may be far from using a rational strategy, and may not understand the tradeoffs between risk and reward, and the idea of diversifying to obtain the same return at a lower risk.

Some institutional investors use c=6 (personal communication). The atypical Berkshire Hathaway is much more aggressive; one source estimated that they use c=1.25. A wide range should be expected, as some funds focus on growth while others emphasize security.