You are able to do this Shabar mantra chanting for eleven, 21, 31, or 41 days, the put and time of mantra chanting needs to be a similar for the amount of days you need to do sadhana. You can use Rudraksha or Tulsi rosary to chant the mantra. https://vashikaran21086.fireblogz.com/63693272/new-step-by-step-map-for-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra