Yes, I can lose book value of 50 % in a really bad crash, but why would the market not go back up after that? (money.stackexchange.com)
Looking at the above chart, Bitcoin's worst crash lasted 411 days, ending in January of 2015. (virtualmining.com)
Following on from the terrible Formula 4 accident of Billy Monger, an FIA investigation found that the rear jacking point may have been a significant factor of how bad the crash was. (wtf1.com)