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Toby Keith says he's not sure just how much playing time he'll get at this weekend's "Oklahoma Twister Relief Concert."  But he indicates concertgoers can expect a full day of music. 

The country star tells his set length will depend on how long his guests perform, and if they're "ahead of schedule" he'll deliver his full show.  But he admits he'll be keeping an eye on the clock, and if it's 10:00 before he takes the stage he'll "shorten" his set up. 

The show is slated to begin at 3:00 p.m. local time.  Toby adds that there will be collaborations between the artists.  He says he knows he'll be sharing the stage with Willie Nelson, and he'd "love to jump up there" with Garth Brooks - provided Garth is open to it. 

Ronnie Dunn, Trisha Yearwood, Mel Tillis, John Anderson, and Sammy Hagar are also scheduled to perform, while Carrie Underwood will appear via satellite from the Grand Ole Opry in Nashville. 

Keith's "Oklahoma Twister Relief Concert" will take place at the University of Oklahoma's Gaylord Family - Oklahoma Memorial Stadium on Saturday.  . 

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