Answer and Explanation:
It depends on the situation you are in when it comes to staring.
I would choose No more than 3 seconds on the street and Starting at strangers on the street is risky.
It is rude to stare at people, and staring longer than 3 seconds or even 5 seconds isn't harmful, though it does make people feel awkward and embarrassed at times.
If you live in a sketchy neighborhood or a town that is dangerous, then yes it is dangerous to stare at someone, as some people will try and find any excuse or opportunity to hurt and abuse you, even things such as staring.
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