You are able to do this Shabar mantra chanting for 11, 21, 31, or 41 days, the place and time of mantra chanting really should be a similar for the quantity of times you need to do sadhana. You can use Rudraksha or Tulsi rosary to chant the mantra. https://vashikaran32096.theblogfairy.com/31653050/details-fiction-and-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra