Turnover is not the demon in high-tech it&#x27;s made out to be. My colleague left our company after 3 years (reasonable), then left the next job after two months for a startup.<p>Two months is too short? In that time, he sped up their core calculating engine by 128X.  Then he was bored and idle for almost two months. Then the last day he sped up their data inprocessing scripts by 3 days (from 3 days to minutes).<p>Did he disrupt that company by leaving? No, he disrupted it by revolutionizing their process. Leaving is what you do when &#x27;My work is done here&#x27;. Not a bad thing at all.<p>I expect he&#x27;ll stick at the startup for much longer. Since they have little or no code nor process, he&#x27;ll have to invent that. And that takes time.<p>In tech its not about the time-in-the-chair. Its about the result. And that takes as long as it takes.