As that is a Swyama Siddha Hanuman Mantra it doesn't have for being chanted for a fixed range of Mantra Repetitions for having the ability to utilize it. Particular worship and rituals and guidelines pertaining to path, sitting mat, and counting rosary usually are not proposed for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s