<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by John Boehm:
I was wondering though, if you hold it for a long time (almost 5 hours, still hot when pulled) wont it continue to cook, perhaps to overdone? </div></BLOCKQUOTE>
You won't have a problem with the butts continuing to cook since you are wrapping after they are done and just holding them. If you are worried about overcooking, allow the meat to rest with a foil tent for 5-15 minutes depending on the ambient temperature, (longer if it is warm, shorter if it is cool), and then tightly wrap in foil and towels. The long rest shouldn't hurt a bit!
Now, if you were wrapping mid-cook, you would definitely need to vent the meat before resting as it would surely continue cooking during the rest otherwise.