It is the question that some say Sir Alex Ferguson, aged 70, will never face, let alone answer. Yet perhaps it has never carried a sharper edge than in these last few days when the 13th Premier League title he seemed to have conjured from, if not thin air, then extremely unpromising odds, has almost certainly been taken away.
When does he stop to hold up his hands and say it is time for the smelling of the flowers? When does he acknowledge, as did his great predecessor at Manchester United, Sir Matt Busby, who also made three great teams, that it is time to put down the challenge?
Busby was a mere 60 when he said farewell to the day-to-day cares of managing a club which carried monstrous expectations – and, of course, Barcelona's Pep Guardiola is just 41 as he insists that he desperately needs his year break after a total of just four years in charge of world football's most sublimely gifted team.
But then what do we get from Ferguson but an airy wave of his arm and the cryptic assurance that he will go when he deems the time to be right, which it plainly wasn't a decade or so ago when he pulled back from what he quickly realised would have been a step into the abyss.
He has probably told us as much as we will ever need to know about his astonishing appetite for the action – and the reality that he is no more likely to retreat in the face of his current crisis – and palpable need to make still another team to compete at the highest level – than if he had headed off the threat of Manchester City at the Etihad Stadium last week.
It was, after all, at the highest point of his career, when he had landed in 1999 a historic treble of League, Cup and Champions League that he put the imperatives of his life into a fierce perspective.
The Ferguson credo was spelt out on the final page of his autobiography, Managing My Life, where he said: "I relate to ambitious individuals but I appreciate that in millions of lives talk of ambition is an insulting irrelevance. Sometimes I joke about recognising people's natures in their choice of ideal holidays. Some want to go to Blackpool, others to Spain and some want to go to the moon.
"I tell myself I identify with that last group. Then I remember the people I was raised among. The great holiday adventure of my childhood was to go to Saltcoats on the Ayrshire coast for the Glasgow Family Fortnight... but some families in Govan couldn't afford even that and would go to the local parks to be surrounded by a little greenery. For the men it was respite enough to be spared the noise and the grime of the shipyards for a couple of weeks, to escape the hammer of the Clyde.
"Ambition had nothing to do with their lives. Survival was the essence. Yet there was an incredible warmth of fellow feeling, a loyalty that was deep as the marrow. I wish I could revisit, however briefly, the sense of community that existed in the Govan of my childhood. It could be a rough world but there were wonderful values at the heart. Loyalty has been the anchor of my life and it is something I learned in Govan."
It is an anchor that will no doubt be beset by some extremely stormy weather in the next year or two but if Ferguson has some bad moments contemplating the power that has been assembled across the city at the Etihad Stadium, if he must wince at the advantage City enjoy in terms of players of the now proven competitiveness of Yaya Touré, Vincent Kompany and Sergio Aguero, he might also reassure himself that his own ability to motivate his team has not dwindled conspicuously.
Indeed, some might say that of all his achievements at Old Trafford, last season's title and the fact that United, with just one game left, still have an at-least theoretical interest in the current race, are among the most astonishing.
Ferguson can say that staying so close to a City many hard judges expected to run away with the title is a remarkable statement of nerve and ambition over available resources. The other problem is that if Ferguson does get more money, there is no certainty of sure-fire purchases to strengthen the team – and most notably in midfield, where Paul Scholes and Ryan Giggs have surely reached the limits of their resilience.
The challenge would be daunting for any football man and if Ferguson's apparent willingness to embrace it has to be considered remarkable, it is perhaps less so for those who are closest to him. One of their number said this week: "When Alex talks about loyalty it is something unconditioned by winning or losing. He always lives in the moment, he knows that winning is just the other side of the coin. You are always going to lose at some point. He once said to me: 'The greatest feeling, of joy or despair, comes when the referee blows his whistle. Then, to a large extent, it is gone. You just get on with the business of what you have to do'."
What he has to do now is engage in the toughest battle of his life. However, everything in life is relative. He might tell you that it beats the hell out of the hammer of the Clyde.
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