https://www.techdirt.com/articles/20170926/10442938290/deloitte-hit-cyberattack-that-compromised-client-information-decided-to-basically-tell-nobody-all.shtml

In the wake of the Equifax breach, there has been some discussion about just how quickly companies should publicly disclose when they have been victims of security breaches that reveal client information. In the case of Equifax, the company had essentially been sitting on the knowledge that it was attacked since July before going public in early September. Something like two months, in other words. While most people agree that victim companies should have some time to get their houses in order before opening the window shades, two months seemed like a lot, given the severity of the attack and the number of potential victims among Equifax's clients.

But two months is nearly lightning quick compared with Deloitte, the enormous accounting firm that discovered it was the victim of an attack in March and only bothered to tell the public, along with most of its clients, this week.