He said: "Is that long, five years? No, it's difficult. Listen, the managers in England are obviously under huge pressure, but having said that, I think they're well looked after. They get well looked after in terms of their contracts.
"But there's huge pressure on managers. You look at good managers going in and out of doors and it has you scratching your head.
"I used to try to figure it out before, certain managers not getting enough time at a club, but I've stopped trying to do that, it just doesn't make sense. It's kind of a mad industry we're in at the moment.
"If you can get a bit of stability in your job, fantastic, but at the moment, particularly at club level, it's probably non-existent."
Keane added: "Despite everything I said, I'd like another go, yes."