In my last job I completed a project that had been backlogged for months within about two months of starting. It was still about 6 before I really felt like I h

In my last job I completed a project that had been backlogged for months within about two months of starting. It was still about 6 before I really felt like I had my feet under me, and definitely closer to the year mark before I really had a grasp of the full ecosystem and was operating at the level I'd expect to be. Admittedly this was a larger organization with around 10-15 engineering teams all managing services that had to interact. The numbers I mentioned weren't a hard-fast universal rule, more a rough guideline from the environments I've been both an IC and manager in. I 100% agree lack of fit can absolutely be a reason to leave in < 6 months. One or two of these wouldn't be a concern, however I've seen resumes of people who have been in the industry 8 years, with the average stint being between 6-8 months and none over 2-years. I'll probably pass on this candidate, even if they otherwise look better than my next choice. Sure they might make "significant changes" in the 6 months they are here, but I'll almost certainly be better off in the long run with the person who sticks around long enough to have something resembling deep knowledge of our environment. If they have had a "lack of fit" with that many previous managers, I have no reason to believe I'll be the one they finally click with.