The time horizon is thirty years, which assumes that the last surviving spouse will need money for at least thirty years after the retirement date.

FORBES: Managing Your Retirement Fund In A Secular Bear Market

In fact, people have been living in the Pilbara for at least thirty thousand years, and there are still some six thousand Aborigines there today.

NEWYORKER: The Miner��s Daughter

As Americans, have been told how wasteful we have been for at least the last thirty years.

FORBES: Briefing Book: A. Michael Lipper

Magda is at least thirty, possibly forty years younger than Errol.

NEWYORKER: Magda Mandela

Each time the same mechanic told her the car belonged to the antique brigade and should have been off the road for the last thirty years at the very least.

NEWYORKER: The Woman of the House

Four years from now, I expect to hang on to at least thirty to forty per cent of that twenty-three.

NEWYORKER: Most Likely to Succeed

She always said that she was thirty-five years old, but she had been saying that at least three years.

NPR: Excerpt: 'The Member of the Wedding'