Friends will conclude its 10-year run on May 6 with what NBC is calling a "two-hour extravaganza," the network announced today at the TCA press tour in Hollywood. An hour-long retrospective will be followed by a one-hour series finale. Not to be outdone, Frasier will get similar treatment on May 13, when the 11-year-old sitcom returns to Thursday night for its own two-hour send-off.