During ancient Roman times, the typical time for the Romans to start their dinner, known as "cena," varied depending on the social status and occupation of individuals. Generally, dinner for the upper classes would commence in the late afternoon or early evening, around the ninth hour (approximately 3 PM) of the Roman day. However, for the lower classes, dinner might be served later in the evening. It's important to note that Roman meal times and customs could vary based on regional differences and individual preferences.