15 seconds of meeting?

how valid is it to say that people make up their minds about the person they are first meeting within 15 seconds of that encounter?

I must admit that first impressions are very strong. However, I think that one should be given more than 15 seconds in order to form an opinion of someone's character or intentions.
I used to think this was true. However, I've discovered that after I get to know a person, my first impressions may change so I don't really believe it anymore.
i don't believe in first meeting.
You can know a person your whole life and still not KNOW him...

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