As that is a Swyama Siddha Hanuman Mantra it doesn't have for being chanted for a set amount of Mantra Repetitions for with the ability to utilize it. Unique worship and rituals and principles pertaining to route, sitting mat, and counting rosary usually are not advised for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s