Answer
Rolf Krauss suggests that Sneferu, the first pharaoh of the Fourth Dynasty of Egypt, reigned for 30 years. This estimate is based on an analysis of archaeological evidence, including the number of building projects attributed to Sneferu and the length of time it would have taken to complete them. Krauss's estimate is consistent with other estimates of Sneferu's reign length, which range from 24 to 30 years.