As Rudolph W. Giuliani campaigns around the country highlighting his stewardship of New York City after the Sept. 11 attacks, he is widely hailed for bringing order to a traumatized city. But he has also raised the hackles of rescue and recovery workers by likening his experience to theirs.

On at least three occasions, in responding to accusations that the city failed to adequately protect the health of workers in the wreckage, he has boasted that he faced comparable risks himself. In one appearance he declared that he had been in the ruins “as often, if not more” than the cleanup workers who logged hundreds of hours in the smoldering pile.

Another time he brushed aside safety claims by asserting that his long hours at the site had left him susceptible to “every health consequence that people have suffered.”

So, how much time did Mayor Giuliani spend at ground zero?

A complete record of Mr. Giuliani’s exposure to the site is not available for the chaotic six days after the attack, when he was a frequent visitor. But an exhaustively detailed account from his mayoral archive, revised after the events to account for last-minute changes on scheduled stops, does exist for the period of Sept. 17 to Dec. 16, 2001. It shows he was there for a total of 29 hours in those three months, often for short periods or to visit locations adjacent to the rubble. In that same period, many rescue and recovery workers put in daily 12-hour shifts.