My BDS thighs (skin-on, bone-in, and unscraped skin) usually take about 1-1/2 hours at the 250° +/- pit temps you will use for ribs. They come out great.
KCBS - CBJ
Big Green Eggs, Big Drum Smokers, Big Chiefs, Weber Smokey Joe "Custom Tall Boy"
Oil Patch Horizontal
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Barbecue is not rocket surgery