The answer from computer science is precise.~ Stewart Brand from, https://blog.longnow.org/02016/07/01/brian-christian-seminar-media/
‘When to stop’ is an insidiously difficult problem. Which has been solved. Whether or not you want to read that and learn some crazy heuristics, you already know the power of heuristics. They’re great when they work, until they don’t. So many Americans—whose heuristic is to glance left then step off the curb and then glance right—get wacked by cars in parts of London, they paint, “Look right,” in the street.
…which is great. Unless you’re Craig and your heuristic goes: Look left, look right, look left, and then step off. I look left, notice the words on the street, and look right. Then I go to look left, notice the words again… and look right, instead of left… then my brain screams OMGBECKY look left! Then I go to look left, notice the words again… and look right.