Division figures have long been skewed by a handful of managers who created dynasties at their clubs, to Sir Alex Ferguson, who had 7,640 days in charge at Manchester United, before being usurped by arch-rival Arsene Wenger (7,894).
Ferguson’s successor at Old Trafford, David Moyes, also spent 4,096 days in charge at Everton, while Joe Kinnear (Wimbledon, 2,698) and Harry Redknapp (West Ham, 2,464) also had long spells in their clubs.
Dyche is currently the longest-serving manager in the Premier League by far, although his nearly 10 years at Burnley have included seven seasons in the top flight, six of them in a row.
Jurgen Klopp is next, appointed almost three years after Dyche at Liverpool in October 2015, with Manchester City’s Pep Guardiola third in July 2016.
Number 373 of the CIES Football Observatory Weekly Post ranks the top 90 world divisions according to the average tenure of coaches (as of March 1).
The values range from 1,536 days in Northern Ireland to just 156 days in Saudi Arabia.
Next comes the Welsh Premier League (1,348) ahead of Azerbaijan (1,069), the Irish Premier Division (1,035) and Úrvalsdeild (Iceland, 872).
The English Premier League takes place on average over 772 days.
The average tenure of coaches in Europe is longer than in other continents: 506 days for clubs from UEFA member associations and 402 days for teams from other continents.
An even shorter average tenure was recorded in clubs in the South American confederation: 303 days.
This goes hand in hand with greater player turnover.
The average duration of occupation is much higher than the median duration: 459 days against 243 days.
This reflects the fact that some coaches are able to hold their position much longer than the usual period.
However, on March 1, only 20% of coaches had been in their position for more than two years.
In contrast, 39% had been in place for less than six months.