The distance that a spear can be thrown depends on various factors, including the strength and skill of the thrower, the design of the spear, and the throwing technique employed. It's difficult to provide an exact distance, as it can vary widely.

In ancient times, spears were used as throwing weapons by hunters and warriors. Skilled throwers could achieve impressive distances. Generally, a proficient thrower could throw a spear accurately up to around 30 to 60 feet (9 to 18 meters). However, some historical accounts suggest that expert throwers could achieve distances of up to 100 feet (30 meters) or more.

It's important to note that throwing a spear for maximum distance requires specialized techniques, such as using rotational motion or employing a specific throwing style. These techniques, combined with proper body mechanics and practice, can maximize the distance and accuracy of the throw.

It's worth mentioning that the primary function of spears throughout history has been for thrusting attacks at close quarters, rather than long-range throwing. While spears can be thrown effectively, their design and balance are optimized for close combat and thrusting maneuvers.