Is this a record?
Hughton
Clark
Beale (caretaker)
Rowett
Zola
Redknapp
Carsley (caretaker)
Cotterill
Monk
Clotet
Spooner (caretaker)
Karanka
Bowyer
Eustace
Rooney
Spooner (caretaker)
Mowbray
Venus (sort of caretaker)
Rowett
That averages out at 8 months per manager, even shorter if we assume that Mowbray returns in a few months time to become the 20th. Leeds run us close, but they could at least point to some success during that time (while we've been stinking out the championship year in year out).
Is there any other professional football team that can beat it?