What if this is not a bear market. Has the market ever fallen 20% and then recovered. Well it did of course on that famous day in 1987. The low was in on the first day. The last time a correction exceeded 20% but went no further was twenty years ago in August and (double-bottom) October 1998.
The charts show some, if not complete similarity to 1998. It was preceded by a small 12% correction, then rose to new highs, and then softened by 20% over a months (or a couple of months if you count the double bottom, and there was a consolidation with the 50% point as a base.
My other model (what is there is a bear market) also shows a recovery before falling again, so it is only at the second bottom we will know for sure.