The exact number of years of saving it would take for the average worker to claw out of the middle-class bracket has been revealed—and it’s nearly half a century. In fact, the average worker would need to save their earnings for 52 years, to raise £1.3 million ($1.7 million), the amount needed to move from the middle and become as wealthy as the richest 10%. And for those who happen to be born in the working class, the odds are increasingly stacked against them. Even in the U.S., workers say they’d need at least $2.3 million to feel rich (up $100,000 from two years ago). It would take the average American worker nearly 70 years without a single expense being paid to reach that $4.4 million benchmark—far longer than most people will work in a lifetime.