Homeowners can expect a response from their bank on a short-sale offer within 30 business days, with a final decision taking no more than 60 days, if their loan is owned by Fannie Mae or Freddie Mac.WASHINGTON — If you're one of the estimated 11 million homeowners burdened with an underwater mortgage, a new federal policy change could be good news: Starting in June, when you want to do a short sale to shed your mortgage and avoid foreclosure, you may not have to wait for months to hear back from your bank when you submit an offer from a potential purchaser.