Board Thread:News and Announcements/@comment-6697950-20140102180802/@comment-26391060-20140419095924

My personal interpretation to the first part (However.....) is that, it is just a possibility of why someone getting opposite sex gender avatar, and because the system recognize kirito's gender successfully so I don't think it would be the case. if system have a trouble recognizing would cause a gender-neutral avatar be generated, then those getting these kind of avatar would not be surprised as such.

And yes it does not specifically state it is correlated to play time, but there probably have some reason behind for the person to ask this question so it is a possible factor.