Actually i want all unpublish nodes to be delete automatically whose created date is 2 days ago. I can write php script for that and also include that code in hook_cron api.
but i am confused that my site is set to be run cron after every 3 hours and i want that php script to be run after 24 hours. can i set specific cron time for specific job. i dont want change the site cron job time.