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Over how much time should I dollar-cost-average my bonus from cash into mutual funds?
There have been studies which show that Dollar Cost Averaging (DCA) underperforms Lump Sum Investing (LSI). Vanguard, in particular, has published one such study. Of course, reading about advice in a study is one thing; acting on that advice can be something else entirely. We rolled over my wife's 401(k) to an IRA back in early 2007 and just did it as a lump sum. You know what happened after that. But our horizon was 25+ years at that time, so we didn't lose too much sleep over it (we haven't sold or gone to cash, either).