You are able to do this Shabar mantra chanting for eleven, 21, 31, or 41 days, the place and time of mantra chanting needs to be a similar for the number of times you ought to do sadhana. You should use Rudraksha or Tulsi rosary to chant the mantra. https://gunnervehjh.angelinsblog.com/31643640/5-essential-elements-for-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra