looking long term at previous dips we have had some serious retracements. The worse one by far has been the December 2013 to October 2015 (87% total price loss) with an inital dump of 67% that lasted 23 days. That can put the average price dip around 65%, The current dip is around 59% on the daily chart and we already at I think we will continue to see BTC dip.