While Daymond John was building his clothing line FUBU, which would evolve into a $6 billion brand, the entrepreneur was .

"I was working at Red Lobster for five years as a waiter as I was running this business," the Shark Tank star said at the iConic conference in New York City on Wednesday. At first "it was 40 hours at Red Lobster and six hours at FUBU. Then it was 30 hours at Red Lobster and 20 hours at FUBU, because money started to come in."

Even after FUBU started to take off, John continued waiting tables. He wouldn't do things any differently if he could, he told the audience on Wednesday: "Don't quit your day job."