<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by JimK: Start between 10 and midnight tonight. Take it off when you can stick a fork in it and "spin" with minimal resistance. Start checking for this at around 190*. Pull it right before you eat. So, your plan of resting the whole butt in a cooler until chow time is a good one. Double wrap it in HD foil, then a towel or two. Throw it in the cooler. It'll stay hot for several hours. Pull before serving. </div></BLOCKQUOTE>
I ditto that.
It's harder to overcook going low-n-slow, you get great bark, and if want to cook for a lunch, it's ESPECIALLY the way to go. I rarely do that, but it's nice to use the same method all the time.
However, foil's a great tool if you need to cook during the day for supper. I just prefer the method JimK described, four butts at a time, and w/ water in a ECB charcoal pan, 225-250 at the vent. If you get a good cooler preheated and cook a few butts at a time, you can hold several hours no problem.
I sleep like a baby using a Maverick ET-73 w/ an alarm to wake me up if temps go awry, which is extrememly rare, Stubbs briquettes preferred, and a split drum for a wind break.