Throw distance is how far the air travels before its velocity falls to a reference speed, usually half a meter per second, roughly the point where a seated person stops noticing it. It is not how far the air physically reaches, which is always further.
The catch is that throw depends on the airflow you actually run, not the catalogue airflow. Run a terminal at half its rated flow and the throw does not fall to half, it falls further, because the discharge loses the momentum that carries the column together. A system balanced down for acoustic reasons can leave dead zones a design never intended.
We test throw on a rig, at the flow you specify, with the terminal mounted as it will be mounted. Ceiling, exposed duct and sill mounts all change the answer. If your consultant asks for a throw report with the order, that is a good consultant.