Just over a year about a wrote "Rep of Ireland Managers - Past and Present". It attempted to put some context on the performance of managers through time.
To repeat It does not control for the opposition, venue, competition, etc. but is rather an overview of all games under each manager.
Last year's figure and this year's updated version appear below. The X-axis lists the number of games in charge, while the Y-axis counts the number of games each fails to win. In theory, the "perfect manager" would win every game so the line would be horizontal and at the bottom of the chart. Hence, the steeper the line, the poorer the results.
A win in Greece on Friday will move Kenny ahead of Hand and close him in on John Giles record. Giles lasted 36 games, winning 12. Should Kenny fail to win however, he will be lock-and-step with Hand. Hand only lasted 39 games before getting the sack.