Smart oven had been set up to cook a roast over several hours during the day. About 4 hours in, we noticed the oven was off. There was some residual heat inside, but we had no idea how long it had been cooking versus off. There were no smart oven logs to help either. We could turn it back on and hope it had not been in the food poisoning zone for long, but there had to be a way to find out for sure.