<prompt> Human: Recently quit a job and rolled over my 401k into an IRA. I plan on reinvesting most into a conservative mix ETF portfolio. I want to keep a portion of the account in cash to invest when the inevitable crash comes. What percentage should I keep in cash? How when should I invest when the market turns?  <response>: Far more money has been lost by investors preparing for corrections or trying to anticipate corrections than has been lost in the corrections themselves. Peter Lynch, mutual fund manager at Fidelity 