You are able to do this Shabar mantra chanting for eleven, 21, 31, or 41 times, the place and time of mantra chanting needs to be the identical for the number of times you wish to do sadhana. You may use Rudraksha or Tulsi rosary to chant the mantra. https://vashikaran91955.pointblog.net/most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra-an-overview-75191715