Unlike its competitor “American Idol,” the superstar mentors on "The Voice" are in agreement the singing competition show has failed to find the next big star.

While speaking to journalists at the Television Critics Association summer press tour, Adam Levine said while finding a star on the show "would be really nice" it's not the goal.

"A lot of things have to happen in order for that to take place," he said. "I think the goal of the show is to do what we can do for these amazing singers while they're on the show...I think that we all know that the lightning in a bottle you have to capture in order to be successful in this business is extraordinarily difficult. I'm not sure that that is the overall mission statement of the show."

Levine was accompanied by a slimmed down Christina Aguilera, along with CeeLo Green and the show's host and producer Carson Daly. The show’s fourth mentor Blake Shelton did not attend because he's on tour.

"American Idol'" producers and judges weren't shy about wanting to crank out overnight sensations like Kelly Clarkson and Carrie Underwood. Its 11th season winner Phillip Phillips has had huge radio success with songs like 'Home" and "Gone, Gone, Gone." Even some finalists who haven't made a real mark in the music world like Kellie Pickler and Katharine McPhee still have name recognition and have found success in other areas. (Pickler, who is a country singer, won the most recent season of "Dancing with the Stars." McPhee had astarring role on NBC's "Smash.")

It should be noted "American Idol" has had its flops as well. Ninth season winner Lee DeWyze's album "Live it Up" was a major disappointment. He sold just 151,000 copies. By contrast, Javier Colon, who won season one of "The Voice," sold 46,000 copies of his first post-"Voice" album called "Come Through for You" as of last month.

Aguilera says it's unrealistic to expect someone to turn into an overnight sensation and cites her own career as an example.

"It's not like everything needs to be like boom, boom, boom, then record deal, then No. 1 success. It doesn't happen like that. It didn't happen that way for me either. Like, for instance...my experience with 'The Mickey Mouse Club', the alumni from that show, you know, you have huge names Britney (Spears), Justin (Timberlake), Ryan Gosling, you know, all these names come from that show. But, you know, right after the show, did we rocket to success right after it? No. It takes time."

Of season four winner, Danielle Bradbery, "The Voice" host and producer Carson Daly argued that she has time on her side.

"She has eight years to figure it out, her voice, an album, whatever it might be. And in eight years she'll be the same age as Taylor Swift is right now. She's got time," he said.

Bradbery's new single "The Heart of Dixie" debuted at No. 58 on the Billboard Hot 100 and No. 16 on the country charts.

When asked about the show's ratings decline when its star judges are featured less, the panel seemed a bit irked.

"Isn't the show like huge, though?" asked Levine.

"The show is huge, yes," answered Daly.

"So what's he talking about?" asked Levine, referring to the journalist's question.

To their credit, "The Voice" is a successful TV show. It's nominated in the Outstanding Reality Program Emmy Award category for a second year in a row.

"The Voice" returns for its fifth season on Sept. 23.

Based on reporting by The Associated Press.

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