You are able to do this Shabar mantra chanting for 11, 21, 31, or 41 days, the spot and time of mantra chanting need to be a similar for the quantity of days you want to do sadhana. You can use Rudraksha or Tulsi rosary to chant the mantra. https://vashikaran52839.topbloghub.com/38706543/the-5-second-trick-for-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra