The market ran from Dow 6600 (2008) to Dow 18000 (2015). (Tripled in 7 years on the back of Central Bank's printing money --- was there a 'real' reason for the markets to triple in 7 years? I don't think so, just asset bubbles on the back of this quantitative easing -- i certainly didn't feel a 3x 'correction' on mainstreet).
I suspect we have a lot of room to move down, as the herd is now realizing the unsustainability of global central bank practices.