As that is a Swyama Siddha Hanuman Mantra it doesn't have to be chanted for a fixed quantity of Mantra Repetitions for having the ability to utilize it. Special worship and rituals and principles relating to path, sitting mat, and counting rosary aren't encouraged for chanting this Hanuman Mantra. The https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s