Starling Invasion

Hi.  We have about 50 young starlings who have been out of the nest about 12 days. How long will they be around before they go their separate ways?  We have fed them all along but are they ready to find their own food now?  They have been flying up and down the road some distance but seem to like it here most. Thank you any advice would be helpful...none of the helplines are manned right now it seems.