From whom?
the fans/mongs.
That's kinda tarring people with the same brush and it's not really fair.
Sir Bobby - class manager, did well, fans gave him all the time in the world
Souness - s**** manager, did s****, fans gave him no time
Roeder - s**** manager, did s****, fans gave him no time
Allardyce - s**** manager, did s****, fans gave him no time
Keegan - class manager, did well in the grand scheme of things, fans gave him all the time in the world
Kinnear - meh
Should we, by some stroke of luck, appoint someone like Martinez - his 'time' would depend entirely on how he started. I don't think he'd unpopular appointment but he is a bit of an unknown quantity. If he started badly then fans would get on his back instantly... so in fairness to you, in this respect you would be right calling them mongs - given where we are atm, and given the potential of this manager.
In the past however - whenever a manager hasn't been given time, the fans have been dead right tbh.
sorry, that may have been mis read, i didnt mean all fans were mongs, just the one's who are, wouldnt give him the time.