As that is a Swyama Siddha Hanuman Mantra it doesn't have for being chanted for a set number of Mantra Repetitions for having the ability to use it. Exclusive worship and rituals and principles about route, sitting mat, and counting rosary aren't recommended for chanting this Hanuman Mantra. The Mantra https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s