Typically, the GHR ran about 25 minutes. So why bother with a 15 minute version? Why not add the 10 minutes? As Parm Jim pointed out, they could do an hour if they included a bunch of the songs that were rotated from the show during its 4-decade run. But pick a few that would add up to the typical running time, and include the opening and closing number that, I believe, were the same forever (Welcome to the Golden Horseshoe, and Pecos Bill).
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