There is no point in running Duranta Express on the same route as Rajdhani. These trains should be provided on other routes where train journey takes lots of time(>24 hours) like Guahati-Bangalore, Bangalore-Howrah, Mumbai-Howrah, Bangalore-Jaipur, Guahati-Ahmedabad etc. I feel that limited number of stoppages(Max 4 only, the same way Rajdhani Expresses have) may be acceptable as this will help more people. Also, this would make these trains more popular.