I will give the facts, you use your judgement...I would finish the cook at 325 more broth or water, covered and in the oven, for a fast finish. I would not sweat the 4 hour rule unless your guest are very old and sickly, under 3 or have a week immune system. Any really nasty bugs will be killed along with the worst toxins at temps above 185...There is some risk. But out of 10 hours, some were spent cold, no growth, and several were spent over 120 with anything there not growing or dying. A healthy adults immune system goes a long way toward protecting us. You likely ingest more bacteria eating a sandwich after handling the TV remote....JJ