This doesn't exactly answer your question, but one piece of advice I got early on was to take my current portfolio and project out for 50 years at a 7% return rate (or whatever would be appropriate for your AA), taking both increases and spending into account. That's the average expected return.
It's been useful for managing worry about SORR, and also for not getting too excited when returns are higher than expected. Basically I figure that as long as my portfolio doesn't dip too far below that average projection, I'm more or less okay.
I personally don't expect to ever be beyond the reach of SORR. It's just part of the risk/reward of investing in the stock market. I've mostly made peace with it.