[sweeps]

I can see a strong argument for reducing to maybe 6 weeks of readily available cash if you have a large amount of money in (diversified) taxable funds, but I wouldn't go much lower than that. I think more of a concern than investment risk is liquidity risk. If you had a serious problem, it could take a while for you to get cash out of your funds, after factoring in sale and settlement time, transfer delays, weekends, holidays, market shutdowns, technical glitches, human error, etc.