You can do this Shabar mantra chanting for 11, 21, 31, or 41 days, the position and time of mantra chanting ought to be the exact same for the number of days you wish to do sadhana. You can use Rudraksha or Tulsi rosary to chant the mantra. It https://erickaayus.blogsmine.com/32854187/the-basic-principles-of-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra