I have a similar mindset though less focused on the type of questions being asked and more about how many times I have to answer the same question.

Ideally, the number is one time. As in one conversation where the person walks away understanding the answer. If I have to have that conversation more than once it’s a problem.

Obviously there’s nuance - it can take time to get your head around a new concept or hard problem. But in any case, I like that as one dimension when thinking about a person’s skill/level/potential.