I was in a meeting the other day where one of the attendees had been working at the company for 20 years and another for 15. By my guess, I reckon people work here for about 7 years on average before moving on.

In my experience, people tend to be either lifers and stay for 10+ years, or bounce between jobs every year or two. Lifers tend to accumulate in companies that cater towards them (good work/life balance and job security) due to low employee turnover, so if you're in the other group, it appears that everyone in the industry only works for a year.