I bought a 5lb bottom round rump roast yesterday and I'd like to slow cook it during the day so that I can slice it for dinner sandwiches. I've tried looking for cook times online, but I can only find recipes that use sear methods, or temperatures over 325 degrees. I want to cook it at 250 degrees for a longer period of time. Any suggestions on how long I should cook it per pound? I intend on letting it rest for an hour at room temperature before cooking. If I were going to be home, then I would monitor the temperature myself, but I will be gone all day and someone else will be cooking it using my directions.