That does not feel true to me in Poland. I'd say average is close to what's expressed here on HN, about 2 years in a job. More junior people switch more often,

That does not feel true to me in Poland. I'd say average is close to what's expressed here on HN, about 2 years in a job. More junior people switch more often, and more senior less often - but also can switch pretty fast if the job is not a good fit. I don't think worker rights play a role here, because I've never seen software engineer being fired for a purely performance reason.