Okay.
“Reasonable” is a legal concept, and it's well understood at law. That's what courts do; they adjudicate reasonable claims. It does give them quite a bit of latitude to decide what is reasonable and what is not in the circumstances. The objective, of course, is to avoid having a court think it has to compensate any claim, no matter how frivolous or minor. It's looking for reasonable costs, reasonable activities, and the trigger of being objectively ordered by somebody to do it.