New York City Mayor Michael Bloomberg is a successful man.

He founded an eponymous financial services firm in 1982 that has since become indispensable to traders and market analysts. He later launched his own (also eponymous) news business, as well as other (yes, also eponymous) business ventures. He's served three terms as the mayor of America's largest city, after convincing the city council to scrap the old two-term limit.

With an estimated net worth of $27 billion, he's now the 13th richest person in the entire world.

So how has Hizzoner become so successful? By trying really hard not to crap on the job, it turns out.

During Bloomberg's radio program Friday, a caller asked him to impart some personal tips for success. In addition to some expected platitudes — "take risks", "don't stop learning" — Bloomberg also said it's wise to work as hard as possible, all the time, even if that means skimping on lunch and bathroom breaks.

His full quote, as transcribed by the New York Observer:

I always tried to be the first one in in the morning and the last one to leave at night, take the fewest vacations and the least time away from the desk to go to the bathroom or have lunch. You gotta be there. I mean, everybody says, "Oh, that's crazy!" But if you want to succeed…you can't control how lucky you are, you can't control how smart you are, but you can control how hard you work, so that's the first thing. [New York Observer]

Bloomberg has given the same advice in the past, as New York's Dan Amira points out. Back in 2011, he took an even stronger anti-bathroom stance, saying, "Don't ever take a lunch break or go to the bathroom, you keep working."

Other prominent, successful New Yorkers aren't so sure that's a great long-term strategy.

And Bloomberg himself, despite what he says, is known to enjoy a good vacation here and there.

The outgoing mayor owns 10 homes, according to Forbes, including ones in London, Bermuda, and the Colorado resort town of Vail. He was also notably absent when a mammoth blizzard slammed New York in Christmas 2010. His private jet, it was later revealed, had been seen in Bermuda on the day the storm hit.