Like most Vedic or Puranic Mantra Experiments, there can be no fixed prescriptions as to the exact practice of these unique and potent Mantras. Most of the prescriptions are adaptations based upon the personal experiences or preferences of Rishis, Munis and Sadhaks or Gurukuls.
One thing to remember is that the Mantra in itself is the most important ingredient in any kind of Mantra Sadhana, and it should never be over-shadowed by mere customs or rituals.
As per the writings of the text, this Voodoo Vashikaran Spell is stated to gather strength and start becoming vibrant after the conclusion of 125, 000 Mantra Chants.
ॐ नमो भगवते गङ्गे कालि कालि महाकालि महाकालि मासं शोणित भोजन रक्त कृष्णमुखि वशमानय मनुषान् स्वाहा ||
Om Namo Bhagavate Gange Kali Kali Mahakali Mahakali Maasam Shonit Bhojan Rakt Krushnamukhi Vashamaanaya Manushaan Swaha ||
Note- This Mantra has also be called in these Tantrik Texts as the Ganga Vashikaran Mantra.