What is the longest war stage?

Cold weapon war refers to the traditional form of war using non-mechanized and non-firepower weapons, such as knives, swords, bows and arrows. This stage lasted for thousands of years, from the earliest civilization period in human history to modern times. These include the conquest and struggle between ancient empires and kingdoms, such as the Spring and Autumn Period and the Warring States Period in China, the expansion period of the Roman Empire, and the struggle between feudal lords in medieval Europe.