West rim 3 hrs...but this is not pinnacle Grand Canyon. You can walk out on the clear overhang, but reviews say West rim is disappointing.
South rim 4-5 hrs...but this is the Gr. Canyon we all see in pictures. Definitely the recommended rim.
We will be taking a bus tour from LV to S. Rim for $79pp including lunch. http://www.lasvegasgrandcanyontour.com/BUS-grand-canyon-south-rim.php