In the past seven years, cybersecurity teams have cut down the time it takes to discover a security intrusion by fourfold. However, that improvement in the window between initial attack and discovery of the incident isn’t nearly enough to make a difference in blocking the typical intrusion from turning into a full-fledged data breach. Most organizations would need to make that time to discover at least 100 times faster to actually prevent most successful breaches of data. Verizon Data Breach Investigation Report showed that once they’ve compromised their target, the time takes attackers to breach data is orders of magnitude shorter than it takes for victims (or third parties) to discover an attack.”]
Source: https://www.darkreading.com/attacks-breaches/attacker-dwell-time-still-too-long-research-shows