Today Joe Nieuwendyk, in his fifth day in the job fired coach Dave Tippett. That makes it 13 coaches who have been fired or resigned during the current season. That's a turnover of 43% per season. Add to that the 6 coaches who have only been with the current team for one complete season and you have 19 or 63% of coaches have been with their current team for 82 or fewer games. These guys don't last as long as a minority government in Ottawa.
There are only 2 coaches (Lindy Ruff and Barry Trotz) who have been with the current team for 5 complete seasons. No job security here.
So how does this compare to the experience in the NBA? Well it's similar. There are 16 coaches (53%) who have been with their team for one full season or less. And 3 coaches have stuck with their current team for 5 full seasons.