You can do this Shabar mantra chanting for eleven, 21, 31, or forty one times, the spot and time of mantra chanting need to be the identical for the number of days you would like to do sadhana. You should use Rudraksha or Tulsi rosary to chant the mantra. https://your-directory.com/listings13203063/a-simple-key-for-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra-unveiled