Chinese spears, known as Qiang, vary in length depending on their specific purpose and historical period. However, the typical length of a Chinese spear ranges from approximately 7 to 14 feet (2 to 4 meters).

Here are some common variations of Chinese spears and their associated lengths:

1. General Purpose Spear: The general-purpose Chinese spear, often used by infantry, measures around 9 to 12 feet (2.7 to 3.7 meters) in length. This length provides a balance between reach and maneuverability, allowing for effective thrusting and slashing techniques.
2. Long-Handled Spear: Some Chinese spears, designed for cavalry or specialized infantry units, feature longer handles. These long-handled spears can range from 12 to 14 feet (3.7 to 4.3 meters) in length. The added reach compensates for the mobility limitations of mounted soldiers or supports the use of the spear in formation-based warfare.
3. Shorter Spears: In certain historical periods or specific regional styles, shorter Chinese spears were also used. These shorter spears could range from 7 to 9 feet (2.1 to 2.7 meters) in length. They were often employed by infantry in tight or close-quarters combat, where the longer reach of larger spears might be less advantageous.

It's important to note that these are general measurements and the actual lengths of Chinese spears can vary depending on the specific design, regional variations, and historical context. Additionally, the lengths mentioned above are approximations and can differ based on individual preferences, military doctrines, and the specific time period in Chinese history.