While the 25% peak-to-trough drop in the S&P 500 ranks in the lower range of bear-market wipeouts, it took a particularly jagged route to get there. At 2.3 days, the average duration of declines is the worst since 1977. Throw in three separate bounces of 10% or more and it was a market where hopefulness was squeezed as in few years before it.