Prolonged absences arouse worry. After Mr. Bloomberg did not show up at a restaurant called Rustico for an unusually long stretch last summer, the manager asked the mayor’s Bermudan housekeeper if everything was all right.

She explained that the mayor was busy campaigning for a third term, making travel to Bermuda next to impossible (and undoubtedly impolitic). “She said he would be back,” said the manager, Antonino Amato.

The Bermudan jaunts do pose political risks. New York City mayors have historically prided themselves on working seven days a week and racing to the scene of an emergency even on the weekends.

Mr. Bloomberg does not. His aides know better than to schedule public events after Friday mornings, allowing the mayor to make his getaways to Bermuda on Friday afternoon and be back in New York by Sunday evening. (Of the 17 Fridays since Dec. 31, the mayor had no public events scheduled after 10 a.m. on 13 of them.)

The mayor’s aides say he can get back quickly if needed — the flight between New York and Bermuda takes about two hours — but there have been some notable absences.

In February, a City Hall aide was struck by a car early one Sunday morning and fell into a coma, ordinarily an emergency that would prompt a mayoral visit. The mayor spoke to the aide’s grieving family by telephone while aides rushed to the hospital. Mr. Bloomberg eventually met with the family late Sunday afternoon, after returning to New York.

Two weekends ago, Mr. Bloomberg skipped the annual Greek Independence Day Parade on Fifth Avenue, leaving some spectators miffed. He has attended the parade for the past two years, and was grand marshal in 2006. During the mayoral campaign last fall, he often boasted of his connections to Greek New Yorkers, even printing up thousands of signs that declared, “Greeks for Mike Bloomberg.”