Note - please ask with regard to the policies, time, place and variety of mantra chanting of your stated mantra plus the day from a professional pundit पंचश्याच्युत्मानमेका विचित्रा वेरीम Even following the completion of 40 times of meditation, no less than one rosary should be chanted day-to-day. Mantra Siddhi is https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s