The Portuguese has never stayed longer than that at any club.
Today he faces Arsene Wenger, who is leaving Arsenal after an epic 22 years.
But Mourinho, who joined United in 2016, said: “At other clubs I’d think, ‘what next’. I don’t want to do anything different now.”
The Old Trafford chief insists he is keen to follow the example of Arsenal chief and boss into his late 60s.
The Special One, 55, has previously spoken about retiring after a stint as a national coach.
But now he would be happy at to remain at United for many seasons, although he accepts Wenger will be the last manager to get two decades at a club.
Mourinho said: “For sure I will carry on like him.
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“I had things I had to do. I had to go to Italy for sure. I had to go to Spain for sure. Things I really wanted to do.
“At this moment, there isn’t anything I have around the corner.
"I don’t want to do anything different from what I am doing now.”
Mourinho has never spent more than three years at a club and says it is getting more difficult to have a long period in charge, let alone the 22 years Wenger had at Arsenal.
His spell at United will be his longest — four years — if he sees out his contract until 2020, with an option for another season.
He admits he would stay even longer if he was wanted.
Mourinho said: “I could see myself with that amount of time at one club — but you don’t allow it any more.
“The new concept of media, social media, pundit industry, the way people can express and influence opinions, I think it is too much pressure.
“Not just for the manager but also for the club. I think it is impossible for someone to resist for a long time now, especially without success.
“To stay a manager, to have four or five years, to try to get a trophy and improve and change the team, I don’t think you allow that anymore.”
Mourinho taunted Wenger for just such a lack of success between 2005 to 2014 — when the Frenchman failed to win a single trophy.
He infamously branded his rival a “specialist in failure” before Wenger started picking up FA Cups.
But ahead of their clash at Old Trafford today, Mourinho says managers get better and better with age — which is why he will keep going.
And why he expects Wenger to carry on after leaving Arsenal at the end of the season.
Mourinho added: “Until the point you lose your motivation, you keep improving.
“Sometimes people say, ‘Enough is enough, I don’t want more’ but until that, it is the kind of job where experience makes you better.
“In every way, I am a better manager than five or even ten years ago.
“And from the motivational point of view, I am the same, nothing has changed.
“My passion for the job is still the same and my sense of responsibility and emotional control is better.
"Obviously, I am much more mature. At every level — training, matches, relations with players, it feels like deja vu.
“It is very difficult now to find something in my professional life that I am surprised with, or I don’t know how to react to. I have seen it all before.
“It’s a job where the more experience you have, the better you are.
“You have the great example now of Jupp Heynckes at Bayern Munich, who is 72.
“He was retired, playing with his grandchildren, then suddenly he comes back to football and he is even better than before.”
Mourinho’s feisty relationship with Wenger has thawed now.
But he still expects to meet the 68-year-old in future clashes on the sidelines.
Mourinho added: “First of all, I don’t think he is dead yet!
“And I don’t think that he has ended his career.
“Until I have different information, he is only going to end his time as Arsenal manager.
“I am going to remember him as a big opponent, as the manager of the Invincibles.
“The Invincibles I met when I arrived in this country in 2004, the Invincibles that made me a better coach.”
MAN UTD (likely): De Gea, Valencia, Smalling, Jones, Young, Herrera, Matic, Pogba, Lingard, Lukaku, Sanchez.
ARSENAL (likely): Cech, Bellerin, Mustafi, Holding, Monreal, Ramsey, Ozil, Xhaka, Iwobi, Aubameyang, Welbeck.
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