Read the signal on time: The 2 years rule for new employees:

Starting a new role is exciting, but it’s wise to observe the longevity of your new colleagues. A staff turnover rate where half or more of employees have been there for under two years should raise concerns. This statistic frequently points to underlying problems such as a dysfunctional work environment or an unhealthy company culture, making it difficult for individuals to thrive and commit for the long term.