Hi all!
I was able to find half and half cows cream (Kroeger,s brand) convience store/ gas station.
At 11AM, I warmed the cream to the correct temperature and added the culture from New England Cheese Making. I covered the bowl with a cloth kitchen towel. The kitchen was within the recommended temperature. At 11PM, I checked the progress. I could not detect that anything had happened. I rechecked the ambient temperature. I thought perhaps the cream was mislabeled or the culture was bad. The next time I checked it 21 hours had elapsed. Yey! It was sour cream with great flavor but a wee bit thin. I will add some powdered milk the next time as a thickener.