The five-year freeze on mortgage interest rates recently announced by the federal government may be intended to help responsible homeowners avoid foreclosure, but a noted economist with the Real Estate Center at Texas A&M University ... Online mortgage applications are quick. An online application form takes about four minutes of your time filling it up. Approval can then be given within 24 hours. This is a far cry from the several business days it usually takes for traditional mortgage applications to be approved. In this regard, online mortgages are less time-consuming and even initially paper-free.