my 401k has done wonderful....do I get out of the market and miss any other gains, and any losses, or stay the course?
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That depends, on your financial situation, age, and risk tolerance to name a few things.
How much are you willing to lose in that 401K? A good question to also answer is: If you lost all you have invested, would you be ok with that, or would it be so awful, that you could never recover financially or at least by your retirement age?