How many times should a guy ask a girl out before giving up?

Sometimes girls play hard to get, sometimes girls do not know how to say no directly, sometimes they r not interested n do not want to tell u straight, sometimes they r afraid, shy or scared when a guy asks them out

Since most girls will not clue a guy in How many times should a guy ask before he gives up n moves on?
How many times should a guy ask a girl out before giving up?
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