Disclaimer: My middle name is "Chicken Feathers".
Would I ever go to all zero equities? Never gonna happen.
I changed my AA from 60/40 to 50/50 right after I FIREd in April 2007. I wanted to see how that "middle of the road" AA would fare over a 1 year period.
Add 365 days, then a few more months, and I found myself sitting on a
-25% unrealized overall portfolio loss at the end of 2008.
My personal risk limit was exceeded, in real time with real data.
In early January 2009, I reset my AA to 40/60 and intend to leave it right there. This is where I feel comfy.
You need to find your own personal risk comfort zone.