Jack Gibson reckoned 3 years was his limit. But there may have been inbuilt assumptions to that view that no longer apply im the modern game, like being able to reinvent a roster quickly, employ more assistants, and so on.I've come up with a theory that once a political party has been in power for 10 years they become stale and out of ideas. Maybe this 10 year barrier also applies to coaches? Any stats to support this? Bellamy obviously the outlier but maybe reinvents himself every few years- but also came up a new dirty tactic every few years now banned by NRL.