gistfile1.cs

// this needs to go into the ship's AI script

public integer numFramesBetweenAICall;
integer currentFrame;

void Awake()
{
  numFramesBetweenAICall = 5;
  currentFrame = 0;
}

void Update()
{
  currentFrame = mathf.repeat(currentFrame + 1, numFramesBetweenAICall);
  
  if(currentFrame == 1)
  {
    // run AI logic
    // for example
    // closestAsteroid = GameManager.instance.ClosestAsteroid(transform);
    // then do something with closestAsteroid
  }
}