Blackburn boss Hughes: Fergie wouldn't have survived today
He said: "You would have to say the days of guys like Sir Alex getting three or four years to sort things out are well gone.
"Everyone is aware of that. It goes with the territory and as a manager you have to accept it.
"We were only two or three games into the season when people started coming under pressure, maybe because they've lost a home game and haven't picked up points on the road.
"At Blackburn, we picked up four points from our first two games and I think it took five or six games before we had that total last year. By that rule of thumb it's a good job it's this year and not last year.
"There's a lot of pressure out there, with forums and platforms for people to have an opinion on other people's job qualities and how they do their job.
"What annoys me is that, more often than not, those people aren't in possession of the facts anyway."
Hughes added: "I think everybody has been astounded by it and it started with Neil McDonald at Carlisle after one game, which was pretty outrageous.
"You don't know the circumstances of every club, but there's a ridiculous amount of pressure on managers these days compared to 10 or even five years ago.
"Managers have to have immediate success or they are in trouble."