impdp job resuming through Script

  hi, let me first give you an overview. we have a schema in prodcution DB. we daily perform schema level logical backup(expdp) on production. reason is we have very frequent request to restor production schema level backup on development database. to restore we are using impdp as it must be. now problum is schema restoration process takes almost 24hrs as development server have physical resource issue.(CPU,RAM etc) and size of schema to restored is 800G. let come to the point daily we have cold backup of development database of selective DB file which execute by a script as cron job at 4AM and DB got up