In my own experience, I see an average of 3 years. Then there are those who do short stints and more on while others will stick around as long as things are int

In my own experience, I see an average of 3 years. Then there are those who do short stints and more on while others will stick around as long as things are interesting. Also the length of projects vary from industry to industry. When I was doing hardware/firmware, an average project was 2-3 years long so people would atleast stick through that.