There are multiple reasons for the relatively rapid burnout of Chief Information Security Officers (CISOs) The average CISO remains in a given position for only 17 months. The CISO role has taken on greater importance and influence over the past decade. The need for cybersecurity is bigger than before, and there is an imbalance between the number of security vendors and number of CISOs. Cloud architecture may also be a factor, specifically SaaS (software as a service delivery models, lowering the barrier to entry)”]
Source: https://www.csoonline.com/article/3077243/vendor-overload-adds-to-ciso-burnout.html