Jose Mourinho was dismissed within a year of winning a couple of titles
Claudio Ranieri was fired around 6 months after taking Leicester City to a miracle PL title. Pochetino was sacked a few months after taking Tottenham to a Champions League final.
But soccer clubs are a lot more trigger happy. If this was soccer, Adam Simpson and Ken Hinckley would be long gone, and Longmire would probably be hanging by a thread.