As that is a Swyama Siddha Hanuman Mantra it doesn't have to be chanted for a set variety of Mantra Repetitions for being able to utilize it. Unique worship and rituals and procedures relating to direction, sitting down mat, and counting rosary usually are not advised for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s