You are able to do this Shabar mantra chanting for eleven, 21, 31, or forty one days, the location and time of mantra chanting need to be exactly the same for the number of days you wish to do sadhana. You may use Rudraksha or Tulsi rosary to chant https://kylerdgklm.blogrelation.com/38513082/the-basic-principles-of-most-powerful-sarv-karya-sidh-shabar-mantra-karya-siddhi-shabar-mantra-most-powerful-shabar-mantra