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First question, IMO, a year at least. People are too elastic these days. People often try hard to be someone that they are not in order to please a person. You can't be sure how someone really is, until after a while. Eventually the person's true colors will show. If you give them enough time for them to get comfortable, or the opposite, extremely stressed the elastic behaviors should decrease. IMO you cannot collect enough data on a person under a year, people are hell of good actors.
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