AUSTIN, Texas -- Lance Armstrong has finally come clean.

Armstrong confessed to doping during an interview with Oprah Winfrey taped Monday, just a couple of hours after a wrenching apology to staff at the Livestrong charity he founded and has now been forced to surrender.

The day ended with 2½ hours of questions from Winfrey at a downtown Austin hotel, where she said the world's most famous cyclist was "forthcoming" as she asked him in detail about doping allegations that followed him throughout his seven Tour de France victories.

Speaking on "CBS This Morning," Winfrey said Tuesday she had not planned to address Armstrong's confession before the interview aired on her OWN network but, "by the time I left Austin and landed in Chicago, you all had already confirmed it."

"So I'm sitting here now because it's already been confirmed," she added.

The session was to be broadcast on Thursday but Winfrey said it will now run in two parts over two nights because there is so much material. The interview will be shown beginning at 9 p.m. both Thursday and Friday in 90-minute shows.

Winfrey would not characterize whether Armstrong seemed contrite but said he seemed ready for the interview. "I would say that he met the moment," she said.

"I don't think 'emotional' begins to describe the intensity or the difficulty he experienced in talking about some of these things."

The confession was a stunning reversal for a proud athlete and celebrity who sought lavish praise in the court of public opinion and used courtrooms to punish his critics.

The World Anti-Doping Agency said Armstrong must confess under oath to seek a reduction in his lifetime ban from sports.

WADA director general David Howman told The Associated Press that Armstrong's interview with Winfrey is "hardly the same as giving evidence to a relevant authority" that deals with doping rules and sanctions.

"He's got to follow a certain course," Howman said. "That is not talking to a talk show host."