Boards tend to treat the signed offer as the finish line. It is the point where the real adjustment begins, and the research on how newcomers settle in suggests that is where a good hire can still go wrong.

The statistic to be careful with

You will often hear that between a third and a half of new executives fail within 18 months. The figure is widely repeated and often quoted without a traceable source, and the versions we found came from vendor data or secondary citations rather than a named study. We would rather not repeat a number we can't source. What the evidence does support is less dramatic and more useful.

How long it takes

In The First 90 Days, Michael Watkins describes a breakeven point: the stage at which a new leader has started creating more value for the organization than they have consumed. According to published summaries of his work, it takes just over six months on average. The first 90 days isn't a deadline. It is the window in which that curve is shaped.

What drives adjustment

A 2024 meta-analysis in the Journal of Management by Talya Bauer and colleagues reviewed 256 studies of how newcomers adjust to organizations, with 183 usable for the meta-analysis. Three things stand out: proactive behavior by the newcomer, acceptance by colleagues, and the person's sense of fit. Proactivity is partly a matter of personality, acceptance is earned in the first weeks, and fit depends on what the organization actually asks of the person. None of the three is fixed by an orientation schedule.

What a search already knows

By the time someone accepts an offer, a thorough search has already measured much of what shapes their first months: how they learn, where they tend to overreach, what pressure does to them, and how they were seen by people above, below and alongside. Most of it is used to choose the candidate and then filed away. It is the best available input for the first 90 days, because it shows where a new leader needs allies early and which habits could derail them.

That is why every placement we make includes a 90-day onboarding plan built from our assessment findings, grounded in the research behind Executive Science, so your new leader starts strong. You can see where it fits in our methodology.