Only 23 were permanent managers though (in the 23 that does count Gunning who even though is technically a temporary manager he can be classed as manager for managing 18 games).
Colin Todd
Andy King
Roy Evans
Andy King
Iffy Onoura
Dennis Wise
Paul Sturrock
Maurice Malpas
Danny Wilson
Paolo Di Canio
Kevin MacDonald
Mark Cooper
Martin Ling
Luke William
David Flitcroft
Phil Brown
Richie Wellens
John Sheridan
Ben Garner
Scott Lindsey
Jody Morris
Michael Flynn
Gav Gunning
17 were temporary with some doing more than 1 spell as temp manager.
Breaking down the figures further the temporary managers have been - with games in charge figures.
David Tuttle 0
Ady Williams 2
Dave Byrne 18 (2 terms)
Paul Bodin 2
Fab Picarretti 1
Tommy Miller 2
Lee Power 4
Matt Taylor 1
Noel Hunt 2
Tommy Wright 2
Gav Gunning 1st time 3 (2 terms)
Then in the permanent manager list there have been a few that for whatever reason didnt stay long and all left of their own volition and not the club deciding, and, all with less games that Gunning has been in charge.
Martin Ling 9
Dennis Wise 17
Kevin Macdonald 14
John McGreal 0
That TBH seems a pretty standard turnaround of managers at this level I would think.
Yeah the Chelsea figure does include caretakers etc as well.
Thing that stood out for me when I looked was the manager who didn't actually manage a game for us and the fact that it seems to have been ages since anyone has stayed for much more than a year. Just a repeated pattern of hope followed by despair.