As of this writing, the current bear market has surpassed the 1973-1974 (oil crisis) bear market and the tech crash of 2000-2002 in magnitude. Those lost 48% and 49% peak to trough respectively. The current bear has lost 56% so far.
It has now matched almost exactly the 1929-1932 crash 17 months into the bear. But the 1929-1932 crash went on to last a total of 34 months and lost a total of 89%.
[chart via chucks_angels]