Strictly speaking, Adsense approval is given by Google and it doesn't care about the no. of hubs. As long as your hubs have good quality content Google will give its approval.
There is general impression that Asian publishers will have to wait for about six months before getting the approval from Google. Google is not very strict on this as long as the content is of good quality and has substantial original content.
Write about 10-12 hubs of good quality within a period of about one month and apply for Adsense - your chances of approval will be higher.