Emergency savings to live on should be 6 months to 1 year, depending on how easy it is for you to find work, and for retirement/voluntary reduction in hours worked, you'll want to plan on having saved up enough that you can draw 4% of the retirement savings every year; at that burn rate that should last until death.
Don't discount social security if you're entitled to it. You may not receive full benefits, but you will receive something. I suggest http://www.ssa.gov, calculating your benefit, and then reducing it by 25%. That takes into account the chance that Congress won't top of the SS trust fund with general tax revenue when the trust fund is exhausted.