The organisation I work for reckons that if its systems were down for 5 consecutive days its business would be destroyed. Maybe we would not be bankrupt, but we think we would loose maybe 90% of our market share.

A job board in the UK in about 2004 had an issue where it could not update the list of jobs it had on its site for maybe 4 days. This outage caused that board to close down its UK business. If this has been publicly described you might find more details via Google.

In the late 1980s, a Frence insurance company thought it would deal with business continuity by building a 2-floor datacenter. Every bit of kit on the bottom floor was replicated with the same kit on the top floor. They forgot about floor loading and one day the top floor collapsed on to the botton floor. They did not go bankrupt but the French government made them sell the business to another organisation.