Cooking a Sirloin Tip Roast today for the first time. I have ventured to many different meats, but so far, everything I have read is it will take about an hour per pound cooking at 225. Any suggestions or pointers if that is not right, is greatly appreciated. I am hoping to have it done around 5-6pm, and got went up at 10:30, its a 10lb roast. Here is my roast before I got it onto the smoker, prepped the cooker with cherry/mesquite.