How do I limit the path of a NavMeshAgent?

What I want to do is limit the distance a Navmeshagent can move in a single turn.

What I've already tried is to measure the difference the object has travelled every frame, but this solution is very imprecise, especially at lower frame rates.

Is it possible to have an agent calculate a path to a point far away, but actually set the path end at a certain distance along it?