Really Easy New Member Question for Admins and Adept Members

I've been reading a lot of the characters and I've noticed that there doesn't seem to be any kind of length to History that is more likely to be accepted. What do Admins look for in History?

And I apologize in advance if I get really annoying looking for an incredibly detailed answer. The one thing I dislike about RPs is writing back stories.

Well, admin-sama's policy is: a longer character=faster approval.