José Mourinho has set himself the ambitious target of remaining Chelsea's manager for another 12 years despite returning to the club on his "worst contract" of the past six seasons.

The Portuguese will seek to extend his mastery over Arsène Wenger's Arsenal to 10 games at the Emirates Stadium on Monday as the visitors attempt to hoist themselves above the early pace-setters. Wenger is entering his 18th year in charge across the capital, longevity envied by Mourinho who has noticed a more long-term approach in Roman Abramovich since returning to English football in the summer.

Mourinho signed a four-year contract worth around £10m a season, considerably less than he was earning at Real Madrid, to oversee a Chelsea team in transition. "Realistically I hope at the end of those four years we sit, analyse the situation and that will be the point where we both – club and me – are happy to carry on or happy to separate," he said. "But I would like [to stay for], say, 12 years. I'm 51 next month. I'd say 12 years, and then two to go to a World Cup with a national team. I would prefer the Portuguese national team. England second [choice], yes.

"The best way to [run a club] is to do it with stability. For the players, if you want to help them grow up, you do that much better with stability: in ideas, philosophy, model of play, style of leadership. This all comes from stability at the highest level: with the owners and board and, after that, the manager. The second line of the hierarchy. That stability is very important. You look, for example, to Manchester United and everybody feels David [Moyes] will have his time to do his work in a calm way. I think that's fantastic."

Abramovich had been through five permanent managers and two interims since that divorce from Mourinho in 2007, a turnover that has not checked the flow of trophies into Stamford Bridge. He returned for Mourinho in June and found a manager eager to take on a very different kind of project, and on relatively reduced terms compared with those he had enjoyed with Internazionale and Real. "There were a lot of teams [offered to me] who could be successful immediately in my hands," Mourinho said.

"I had Real Madrid: I left them because I wanted to, not because they wanted me to. I had other clubs in other countries where it would be easier to go and find an 'easy' job immediately. If I was here for financial reasons, I wouldn't be here getting a lot less money than I had at Real Madrid, where I had three more years on my contract.