“The sheer amount of time the attackers had inside the system—four years in all—likely made the breach much worse than it otherwise might have been. Time gives attackers the ability to chip away at defenses, or simply learn more about a system to understand where the valuable data is.” Another day, another massive data breach. This time, Marriott got hacked (and hacked and hacked). Hundreds of millions of people may have been affected. Wired: How To Protect Yourself From The Giant Marriott Hack. (Among other things, this story is a reminder of just how big some companies have become in recent years. Hundreds of millions is a lot of customers.)