I found a really good reading here, https://unix.meta.stackexchange.com/a/264/14220 .
From that article;
the graduation date of a site will depend heavily on having enough users with sufficient reputation to properly lead and govern the site.
and
From what I've heard talking to mods on other sites, the sites that have gone on to launch averaged about 200 upvotes/day during the beta period
According to thisthis page, our all times average votes per day is 94.4. Which is less than half of 200.